Source/WebCore/page/SettingsBase.cpp - WebKit - Git at Google

 /*
  * Copyright (C) 2006, 2007, 2008, 2009, 2011, 2012 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
  *    documentation and/or other materials provided with the distribution.
  *
  * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */

 #include "config.h"
 #include "SettingsBase.h"

 #include "AudioSession.h"
 #include "BackForwardCache.h"
 #include "BackForwardController.h"
 #include "CachedResourceLoader.h"
 #include "Chrome.h"
 #include "ChromeClient.h"
 #include "CookieStorage.h"
 #include "DOMTimer.h"
 #include "Database.h"
 #include "Document.h"
 #include "FontCache.h"
 #include "Frame.h"
 #include "FrameTree.h"
 #include "FrameView.h"
 #include "HistoryItem.h"
 #include "Page.h"
 #include "RenderWidget.h"
 #include "RuntimeApplicationChecks.h"
 #include "Settings.h"
 #include "StorageMap.h"
 #include <limits>
 #include <wtf/StdLibExtras.h>

 #if ENABLE(MEDIA_STREAM)
 #include "MockRealtimeMediaSourceCenter.h"
 #endif

 namespace WebCore {

 static void invalidateAfterGenericFamilyChange(Page* page)
 {
     FontCache::singleton().invalidateFontCascadeCache();
     if (page)
         page->setNeedsRecalcStyleInAllFrames();
 }

 SettingsBase::SettingsBase(Page* page)
     : m_page(page)
     , m_minimumDOMTimerInterval(DOMTimer::defaultMinimumInterval())
     , m_setImageLoadingSettingsTimer(*this, &SettingsBase::imageLoadingSettingsTimerFired)
 {
 }

 SettingsBase::~SettingsBase() = default;

 #if !PLATFORM(COCOA)

 void SettingsBase::initializeDefaultFontFamilies()
 {
     // Other platforms can set up fonts from a client, but on Mac, we want it in WebCore to share code between WebKit1 and WebKit2.
 }

 #if ENABLE(MEDIA_SOURCE)
 bool SettingsBase::platformDefaultMediaSourceEnabled()
 {
     return true;
 }
 #endif

 #endif

 const String& SettingsBase::standardFontFamily(UScriptCode script) const
 {
     return fontGenericFamilies().standardFontFamily(script);
 }

 void SettingsBase::setStandardFontFamily(const String& family, UScriptCode script)
 {
     bool changes = fontGenericFamilies().setStandardFontFamily(family, script);
     if (changes)
         invalidateAfterGenericFamilyChange(m_page);
 }

 const String& SettingsBase::fixedFontFamily(UScriptCode script) const
 {
     return fontGenericFamilies().fixedFontFamily(script);
 }

 void SettingsBase::setFixedFontFamily(const String& family, UScriptCode script)
 {
     bool changes = fontGenericFamilies().setFixedFontFamily(family, script);
     if (changes)
         invalidateAfterGenericFamilyChange(m_page);
 }

 const String& SettingsBase::serifFontFamily(UScriptCode script) const
 {
     return fontGenericFamilies().serifFontFamily(script);
 }

 void SettingsBase::setSerifFontFamily(const String& family, UScriptCode script)
 {
     bool changes = fontGenericFamilies().setSerifFontFamily(family, script);
     if (changes)
         invalidateAfterGenericFamilyChange(m_page);
 }

 const String& SettingsBase::sansSerifFontFamily(UScriptCode script) const
 {
     return fontGenericFamilies().sansSerifFontFamily(script);
 }

 void SettingsBase::setSansSerifFontFamily(const String& family, UScriptCode script)
 {
     bool changes = fontGenericFamilies().setSansSerifFontFamily(family, script);
     if (changes)
         invalidateAfterGenericFamilyChange(m_page);
 }

 const String& SettingsBase::cursiveFontFamily(UScriptCode script) const
 {
     return fontGenericFamilies().cursiveFontFamily(script);
 }

 void SettingsBase::setCursiveFontFamily(const String& family, UScriptCode script)
 {
     bool changes = fontGenericFamilies().setCursiveFontFamily(family, script);
     if (changes)
         invalidateAfterGenericFamilyChange(m_page);
 }

 const String& SettingsBase::fantasyFontFamily(UScriptCode script) const
 {
     return fontGenericFamilies().fantasyFontFamily(script);
 }

 void SettingsBase::setFantasyFontFamily(const String& family, UScriptCode script)
 {
     bool changes = fontGenericFamilies().setFantasyFontFamily(family, script);
     if (changes)
         invalidateAfterGenericFamilyChange(m_page);
 }

 const String& SettingsBase::pictographFontFamily(UScriptCode script) const
 {
     return fontGenericFamilies().pictographFontFamily(script);
 }

 void SettingsBase::setPictographFontFamily(const String& family, UScriptCode script)
 {
     bool changes = fontGenericFamilies().setPictographFontFamily(family, script);
     if (changes)
         invalidateAfterGenericFamilyChange(m_page);
 }

 void SettingsBase::setMinimumDOMTimerInterval(Seconds interval)
 {
     auto oldTimerInterval = std::exchange(m_minimumDOMTimerInterval, interval);

     if (!m_page)
         return;

     for (Frame* frame = &m_page->mainFrame(); frame; frame = frame->tree().traverseNext()) {
         if (frame->document())
             frame->document()->adjustMinimumDOMTimerInterval(oldTimerInterval);
     }
 }

 void SettingsBase::setMediaContentTypesRequiringHardwareSupport(const String& contentTypes)
 {
     m_mediaContentTypesRequiringHardwareSupport.shrink(0);
     for (auto type : StringView(contentTypes).split(':'))
         m_mediaContentTypesRequiringHardwareSupport.append(ContentType { type.toString() });
 }

 void SettingsBase::setMediaContentTypesRequiringHardwareSupport(const Vector<ContentType>& contentTypes)
 {
     m_mediaContentTypesRequiringHardwareSupport = contentTypes;
 }


 // MARK - onChange handlers

 void SettingsBase::setNeedsRecalcStyleInAllFrames()
 {
     if (m_page)
         m_page->setNeedsRecalcStyleInAllFrames();
 }

 void SettingsBase::setNeedsRelayoutAllFrames()
 {
     if (!m_page)
         return;

     for (Frame* frame = &m_page->mainFrame(); frame; frame = frame->tree().traverseNext()) {
         if (!frame->ownerRenderer())
             continue;
         frame->ownerRenderer()->setNeedsLayoutAndPrefWidthsRecalc();
     }
 }

 void SettingsBase::mediaTypeOverrideChanged()
 {
     if (!m_page)
         return;

     FrameView* view = m_page->mainFrame().view();
     if (view)
         view->setMediaType(m_page->settings().mediaTypeOverride());

     m_page->setNeedsRecalcStyleInAllFrames();
 }

 void SettingsBase::imagesEnabledChanged()
 {
     // Changing this setting to true might immediately start new loads for images that had previously had loading disabled.
     // If this happens while a WebView is being dealloc'ed, and we don't know the WebView is being dealloc'ed, these new loads
     // can cause crashes downstream when the WebView memory has actually been free'd.
     // One example where this can happen is in Mac apps that subclass WebView then do work in their overridden dealloc methods.
     // Starting these loads synchronously is not important. By putting it on a 0-delay, properly closing the Page cancels them
     // before they have a chance to really start.
     // See http://webkit.org/b/60572 for more discussion.
     m_setImageLoadingSettingsTimer.startOneShot(0_s);
 }

 void SettingsBase::imageLoadingSettingsTimerFired()
 {
     if (!m_page)
         return;

     for (Frame* frame = &m_page->mainFrame(); frame; frame = frame->tree().traverseNext()) {
         if (!frame->document())
             continue;
         frame->document()->cachedResourceLoader().setImagesEnabled(m_page->settings().areImagesEnabled());
         frame->document()->cachedResourceLoader().setAutoLoadImages(m_page->settings().loadsImagesAutomatically());
     }
 }

 void SettingsBase::pluginsEnabledChanged()
 {
     Page::refreshPlugins(false);
 }

 void SettingsBase::iceCandidateFilteringEnabledChanged()
 {
     if (!m_page)
         return;

     if (m_page->settings().iceCandidateFilteringEnabled())
         m_page->enableICECandidateFiltering();
     else
         m_page->disableICECandidateFiltering();
 }

 #if ENABLE(TEXT_AUTOSIZING)

 void SettingsBase::shouldEnableTextAutosizingBoostChanged()
 {
     if (!m_page)
         return;

     bool boostAutosizing = m_page->settings().shouldEnableTextAutosizingBoost();
     m_oneLineTextMultiplierCoefficient = boostAutosizing ? boostedOneLineTextMultiplierCoefficient : defaultOneLineTextMultiplierCoefficient;
     m_multiLineTextMultiplierCoefficient = boostAutosizing ? boostedMultiLineTextMultiplierCoefficient : defaultMultiLineTextMultiplierCoefficient;
     m_maxTextAutosizingScaleIncrease = boostAutosizing ? boostedMaxTextAutosizingScaleIncrease : defaultMaxTextAutosizingScaleIncrease;

     setNeedsRecalcStyleInAllFrames();
 }

 void SettingsBase::textAutosizingUsesIdempotentModeChanged()
 {
     if (m_page)
         m_page->chrome().client().textAutosizingUsesIdempotentModeChanged();
     setNeedsRecalcStyleInAllFrames();
 }

 #endif // ENABLE(TEXT_AUTOSIZING)

 #if ENABLE(MEDIA_STREAM)

 void SettingsBase::mockCaptureDevicesEnabledChanged()
 {
     bool enabled = false;
     if (m_page)
         enabled = m_page->settings().mockCaptureDevicesEnabled();

     MockRealtimeMediaSourceCenter::setMockRealtimeMediaSourceCenterEnabled(enabled);
 }

 #endif

 void SettingsBase::userStyleSheetLocationChanged()
 {
     if (m_page)
         m_page->userStyleSheetLocationChanged();
 }

 void SettingsBase::usesBackForwardCacheChanged()
 {
     if (!m_page)
         return;

     if (!m_page->settings().usesBackForwardCache())
         BackForwardCache::singleton().pruneToSizeNow(0, PruningReason::None);
 }

 void SettingsBase::dnsPrefetchingEnabledChanged()
 {
     if (m_page)
         m_page->dnsPrefetchingStateChanged();
 }

 void SettingsBase::storageBlockingPolicyChanged()
 {
     if (m_page)
         m_page->storageBlockingStateChanged();
 }

 void SettingsBase::backgroundShouldExtendBeyondPageChanged()
 {
     if (m_page)
         m_page->mainFrame().view()->updateExtendBackgroundIfNecessary();
 }

 void SettingsBase::scrollingPerformanceTestingEnabledChanged()
 {
     if (m_page && m_page->mainFrame().view())
         m_page->mainFrame().view()->setScrollingPerformanceTestingEnabled(m_page->settings().scrollingPerformanceTestingEnabled());
 }

 void SettingsBase::hiddenPageDOMTimerThrottlingStateChanged()
 {
     if (m_page)
         m_page->hiddenPageDOMTimerThrottlingStateChanged();
 }

 void SettingsBase::hiddenPageCSSAnimationSuspensionEnabledChanged()
 {
     if (m_page)
         m_page->hiddenPageCSSAnimationSuspensionStateChanged();
 }

 void SettingsBase::resourceUsageOverlayVisibleChanged()
 {
 #if ENABLE(RESOURCE_USAGE)
     if (m_page)
         m_page->setResourceUsageOverlayVisible(m_page->settings().resourceUsageOverlayVisible());
 #endif
 }

 } // namespace WebCore
	/*
	* Copyright (C) 2006, 2007, 2008, 2009, 2011, 2012 Apple Inc. All rights reserved.
	*
	* Redistribution and use in source and binary forms, with or without
	* modification, are permitted provided that the following conditions
	* are met:
	* 1. Redistributions of source code must retain the above copyright
	* notice, this list of conditions and the following disclaimer.
	* 2. Redistributions in binary form must reproduce the above copyright
	* notice, this list of conditions and the following disclaimer in the
	* documentation and/or other materials provided with the distribution.
	*
	* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
	* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
	* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
	* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
	* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
	* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
	* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
	* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
	* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	*/

	#include "config.h"
	#include "SettingsBase.h"

	#include "AudioSession.h"
	#include "BackForwardCache.h"
	#include "BackForwardController.h"
	#include "CachedResourceLoader.h"
	#include "Chrome.h"
	#include "ChromeClient.h"
	#include "CookieStorage.h"
	#include "DOMTimer.h"
	#include "Database.h"
	#include "Document.h"
	#include "FontCache.h"
	#include "Frame.h"
	#include "FrameTree.h"
	#include "FrameView.h"
	#include "HistoryItem.h"
	#include "Page.h"
	#include "RenderWidget.h"
	#include "RuntimeApplicationChecks.h"
	#include "Settings.h"
	#include "StorageMap.h"
	#include <limits>
	#include <wtf/StdLibExtras.h>

	#if ENABLE(MEDIA_STREAM)
	#include "MockRealtimeMediaSourceCenter.h"
	#endif

	namespace WebCore {

	static void invalidateAfterGenericFamilyChange(Page* page)
	{
	FontCache::singleton().invalidateFontCascadeCache();
	if (page)
	page->setNeedsRecalcStyleInAllFrames();
	}

	SettingsBase::SettingsBase(Page* page)
	: m_page(page)
	, m_minimumDOMTimerInterval(DOMTimer::defaultMinimumInterval())
	, m_setImageLoadingSettingsTimer(*this, &SettingsBase::imageLoadingSettingsTimerFired)
	{
	}

	SettingsBase::~SettingsBase() = default;

	#if !PLATFORM(COCOA)

	void SettingsBase::initializeDefaultFontFamilies()
	{
	// Other platforms can set up fonts from a client, but on Mac, we want it in WebCore to share code between WebKit1 and WebKit2.
	}

	#if ENABLE(MEDIA_SOURCE)
	bool SettingsBase::platformDefaultMediaSourceEnabled()
	{
	return true;
	}
	#endif

	#endif

	const String& SettingsBase::standardFontFamily(UScriptCode script) const
	{
	return fontGenericFamilies().standardFontFamily(script);
	}

	void SettingsBase::setStandardFontFamily(const String& family, UScriptCode script)
	{
	bool changes = fontGenericFamilies().setStandardFontFamily(family, script);
	if (changes)
	invalidateAfterGenericFamilyChange(m_page);
	}

	const String& SettingsBase::fixedFontFamily(UScriptCode script) const
	{
	return fontGenericFamilies().fixedFontFamily(script);
	}

	void SettingsBase::setFixedFontFamily(const String& family, UScriptCode script)
	{
	bool changes = fontGenericFamilies().setFixedFontFamily(family, script);
	if (changes)
	invalidateAfterGenericFamilyChange(m_page);
	}

	const String& SettingsBase::serifFontFamily(UScriptCode script) const
	{
	return fontGenericFamilies().serifFontFamily(script);
	}

	void SettingsBase::setSerifFontFamily(const String& family, UScriptCode script)
	{
	bool changes = fontGenericFamilies().setSerifFontFamily(family, script);
	if (changes)
	invalidateAfterGenericFamilyChange(m_page);
	}

	const String& SettingsBase::sansSerifFontFamily(UScriptCode script) const
	{
	return fontGenericFamilies().sansSerifFontFamily(script);
	}

	void SettingsBase::setSansSerifFontFamily(const String& family, UScriptCode script)
	{
	bool changes = fontGenericFamilies().setSansSerifFontFamily(family, script);
	if (changes)
	invalidateAfterGenericFamilyChange(m_page);
	}

	const String& SettingsBase::cursiveFontFamily(UScriptCode script) const
	{
	return fontGenericFamilies().cursiveFontFamily(script);
	}

	void SettingsBase::setCursiveFontFamily(const String& family, UScriptCode script)
	{
	bool changes = fontGenericFamilies().setCursiveFontFamily(family, script);
	if (changes)
	invalidateAfterGenericFamilyChange(m_page);
	}

	const String& SettingsBase::fantasyFontFamily(UScriptCode script) const
	{
	return fontGenericFamilies().fantasyFontFamily(script);
	}

	void SettingsBase::setFantasyFontFamily(const String& family, UScriptCode script)
	{
	bool changes = fontGenericFamilies().setFantasyFontFamily(family, script);
	if (changes)
	invalidateAfterGenericFamilyChange(m_page);
	}

	const String& SettingsBase::pictographFontFamily(UScriptCode script) const
	{
	return fontGenericFamilies().pictographFontFamily(script);
	}

	void SettingsBase::setPictographFontFamily(const String& family, UScriptCode script)
	{
	bool changes = fontGenericFamilies().setPictographFontFamily(family, script);
	if (changes)
	invalidateAfterGenericFamilyChange(m_page);
	}

	void SettingsBase::setMinimumDOMTimerInterval(Seconds interval)
	{
	auto oldTimerInterval = std::exchange(m_minimumDOMTimerInterval, interval);

	if (!m_page)
	return;

	for (Frame* frame = &m_page->mainFrame(); frame; frame = frame->tree().traverseNext()) {
	if (frame->document())
	frame->document()->adjustMinimumDOMTimerInterval(oldTimerInterval);
	}
	}

	void SettingsBase::setMediaContentTypesRequiringHardwareSupport(const String& contentTypes)
	{
	m_mediaContentTypesRequiringHardwareSupport.shrink(0);
	for (auto type : StringView(contentTypes).split(':'))
	m_mediaContentTypesRequiringHardwareSupport.append(ContentType { type.toString() });
	}

	void SettingsBase::setMediaContentTypesRequiringHardwareSupport(const Vector<ContentType>& contentTypes)
	{
	m_mediaContentTypesRequiringHardwareSupport = contentTypes;
	}



	// MARK - onChange handlers

	void SettingsBase::setNeedsRecalcStyleInAllFrames()
	{
	if (m_page)
	m_page->setNeedsRecalcStyleInAllFrames();
	}

	void SettingsBase::setNeedsRelayoutAllFrames()
	{
	if (!m_page)
	return;

	for (Frame* frame = &m_page->mainFrame(); frame; frame = frame->tree().traverseNext()) {
	if (!frame->ownerRenderer())
	continue;
	frame->ownerRenderer()->setNeedsLayoutAndPrefWidthsRecalc();
	}
	}

	void SettingsBase::mediaTypeOverrideChanged()
	{
	if (!m_page)
	return;

	FrameView* view = m_page->mainFrame().view();
	if (view)
	view->setMediaType(m_page->settings().mediaTypeOverride());

	m_page->setNeedsRecalcStyleInAllFrames();
	}

	void SettingsBase::imagesEnabledChanged()
	{
	// Changing this setting to true might immediately start new loads for images that had previously had loading disabled.
	// If this happens while a WebView is being dealloc'ed, and we don't know the WebView is being dealloc'ed, these new loads
	// can cause crashes downstream when the WebView memory has actually been free'd.
	// One example where this can happen is in Mac apps that subclass WebView then do work in their overridden dealloc methods.
	// Starting these loads synchronously is not important. By putting it on a 0-delay, properly closing the Page cancels them
	// before they have a chance to really start.
	// See http://webkit.org/b/60572 for more discussion.
	m_setImageLoadingSettingsTimer.startOneShot(0_s);
	}

	void SettingsBase::imageLoadingSettingsTimerFired()
	{
	if (!m_page)
	return;

	for (Frame* frame = &m_page->mainFrame(); frame; frame = frame->tree().traverseNext()) {
	if (!frame->document())
	continue;
	frame->document()->cachedResourceLoader().setImagesEnabled(m_page->settings().areImagesEnabled());
	frame->document()->cachedResourceLoader().setAutoLoadImages(m_page->settings().loadsImagesAutomatically());
	}
	}

	void SettingsBase::pluginsEnabledChanged()
	{
	Page::refreshPlugins(false);
	}

	void SettingsBase::iceCandidateFilteringEnabledChanged()
	{
	if (!m_page)
	return;

	if (m_page->settings().iceCandidateFilteringEnabled())
	m_page->enableICECandidateFiltering();
	else
	m_page->disableICECandidateFiltering();
	}

	#if ENABLE(TEXT_AUTOSIZING)

	void SettingsBase::shouldEnableTextAutosizingBoostChanged()
	{
	if (!m_page)
	return;

	bool boostAutosizing = m_page->settings().shouldEnableTextAutosizingBoost();
	m_oneLineTextMultiplierCoefficient = boostAutosizing ? boostedOneLineTextMultiplierCoefficient : defaultOneLineTextMultiplierCoefficient;
	m_multiLineTextMultiplierCoefficient = boostAutosizing ? boostedMultiLineTextMultiplierCoefficient : defaultMultiLineTextMultiplierCoefficient;
	m_maxTextAutosizingScaleIncrease = boostAutosizing ? boostedMaxTextAutosizingScaleIncrease : defaultMaxTextAutosizingScaleIncrease;

	setNeedsRecalcStyleInAllFrames();
	}

	void SettingsBase::textAutosizingUsesIdempotentModeChanged()
	{
	if (m_page)
	m_page->chrome().client().textAutosizingUsesIdempotentModeChanged();
	setNeedsRecalcStyleInAllFrames();
	}

	#endif // ENABLE(TEXT_AUTOSIZING)

	#if ENABLE(MEDIA_STREAM)

	void SettingsBase::mockCaptureDevicesEnabledChanged()
	{
	bool enabled = false;
	if (m_page)
	enabled = m_page->settings().mockCaptureDevicesEnabled();

	MockRealtimeMediaSourceCenter::setMockRealtimeMediaSourceCenterEnabled(enabled);
	}

	#endif

	void SettingsBase::userStyleSheetLocationChanged()
	{
	if (m_page)
	m_page->userStyleSheetLocationChanged();
	}

	void SettingsBase::usesBackForwardCacheChanged()
	{
	if (!m_page)
	return;

	if (!m_page->settings().usesBackForwardCache())
	BackForwardCache::singleton().pruneToSizeNow(0, PruningReason::None);
	}

	void SettingsBase::dnsPrefetchingEnabledChanged()
	{
	if (m_page)
	m_page->dnsPrefetchingStateChanged();
	}

	void SettingsBase::storageBlockingPolicyChanged()
	{
	if (m_page)
	m_page->storageBlockingStateChanged();
	}

	void SettingsBase::backgroundShouldExtendBeyondPageChanged()
	{
	if (m_page)
	m_page->mainFrame().view()->updateExtendBackgroundIfNecessary();
	}

	void SettingsBase::scrollingPerformanceTestingEnabledChanged()
	{
	if (m_page && m_page->mainFrame().view())
	m_page->mainFrame().view()->setScrollingPerformanceTestingEnabled(m_page->settings().scrollingPerformanceTestingEnabled());
	}

	void SettingsBase::hiddenPageDOMTimerThrottlingStateChanged()
	{
	if (m_page)
	m_page->hiddenPageDOMTimerThrottlingStateChanged();
	}

	void SettingsBase::hiddenPageCSSAnimationSuspensionEnabledChanged()
	{
	if (m_page)
	m_page->hiddenPageCSSAnimationSuspensionStateChanged();
	}

	void SettingsBase::resourceUsageOverlayVisibleChanged()
	{
	#if ENABLE(RESOURCE_USAGE)
	if (m_page)
	m_page->setResourceUsageOverlayVisible(m_page->settings().resourceUsageOverlayVisible());
	#endif
	}

	} // namespace WebCore