tree 225e23ae5f0888a13250ddba588cab1787600683
parent 41e421e1cdc375f81142efada1d5c7aa8677a80a
author rniwa@webkit.org <rniwa@webkit.org@268f45cc-cd09-0410-ab3c-d52691b4dbfc> 1571347350 +0000
committer rniwa@webkit.org <rniwa@webkit.org@268f45cc-cd09-0410-ab3c-d52691b4dbfc> 1571347350 +0000

Make requestIdleCallback suspendable
https://bugs.webkit.org/show_bug.cgi?id=203023

Reviewed by Chris Dumez.

Source/WebCore:

Make requestIdleCallback suspendable by making WindowEventLoop itself suspendable.
Because WindowEventLoop can be shared across documents, we don't want to make it an ActiveDOMObject.

Instead, we would make CachedFrameBase::restore and CachedFrame manually invoke suspend & resume.

Test: requestidlecallback/requestidlecallback-in-page-cache.html

* dom/Document.h:
(WebCore::Document::eventLoopIfExists): Added. This should probably go away once most of the event loop
is implemented since we're almost always going to have this object then.
* dom/WindowEventLoop.cpp:
(WebCore::WindowEventLoop::queueTask): Because m_tasks may contain tasks of suspended documents,
we check m_activeTaskCount, which is only positive when there is a task for non-suspended documents,
to decide whether we schedule a callback or not.
(WebCore::WindowEventLoop::suspend): Added. No-op for now.
(WebCore::WindowEventLoop::resume): Added. Schedule a callback if there is a task associated with
this document.
(WebCore::WindowEventLoop::run): Skip a task for a suspended document, and add it back to m_tasks along
with other tasks that got scheduled by running the current working set of tasks.
* dom/WindowEventLoop.h:
* history/CachedFrame.cpp:
(WebCore::CachedFrameBase::restore):
(WebCore::CachedFrame::CachedFrame):

LayoutTests:

* requestidlecallback/requestidlecallback-in-page-cache-expected.txt: Added.
* requestidlecallback/requestidlecallback-in-page-cache.html: Added.
* requestidlecallback/resources: Added.
* requestidlecallback/resources/page-cache-helper.html: Added.


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@251258 268f45cc-cd09-0410-ab3c-d52691b4dbfc