Web Automation: add command to asynchronously load the Web Inspector frontend in the background
https://bugs.webkit.org/show_bug.cgi?id=157509

Reviewed by Timothy Hatcher and Joseph Pecoraro.

In order to make it easier to debug code that executes as a result of an automation
command, this patch adds a new Automation command to asynchronously load the debugger
and Inspector frontend. It is designed for use by automation clients to implement an
auto-inspection feature to aid in debugging automation scripts.

* UIProcess/Automation/Automation.json: Add new command.
* UIProcess/Automation/WebAutomationSession.cpp:
(WebKit::WebAutomationSession::inspectBrowsingContext): Added.
(WebKit::WebAutomationSession::inspectorFrontendLoaded): Added.
This message is forwarded by WebInspectorProxy to the inspected page's session.

* UIProcess/Automation/WebAutomationSession.h:
* UIProcess/Cocoa/WebAutomationSessionCocoa.mm:
(WebKit::WebAutomationSession::sendSynthesizedEventsToPage):
Force the active automation window to become key and bring to front prior to
sending each NSEvent. This way, if the Inspector pauses while a command executes,
the automation window will get back focus when the Inspector unpauses just before
the next synthesized mouse or keyboard NSEvent is sent to its NSWindow.

* UIProcess/WebInspectorProxy.cpp:
(WebKit::WebInspectorProxy::frontendLoaded):
Forward to the inspected page's session.

* UIProcess/WebInspectorProxy.h:
* UIProcess/WebInspectorProxy.messages.in: Add notification of the frontend's load.

* WebProcess/WebPage/WebInspectorUI.cpp:
(WebKit::WebInspectorUI::frontendLoaded):
Kick off notifying the automation session in UIProcess that the inspector loaded.

(WebKit::WebInspectorUI::closeWindow):
In some circumstances, the Web Inspector can be loaded without showing
the window. If this hidden page closes, make sure the frontend host gets
a chance to disconnect its InspectorFrontendClient. Normally this happens
when the window closes, but unshown Inspectors do not get window instances.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@200702 268f45cc-cd09-0410-ab3c-d52691b4dbfc
diff --git a/Source/WebKit2/UIProcess/Automation/Automation.json b/Source/WebKit2/UIProcess/Automation/Automation.json
index 8e5b6fc..e1f58fc 100644
--- a/Source/WebKit2/UIProcess/Automation/Automation.json
+++ b/Source/WebKit2/UIProcess/Automation/Automation.json
@@ -294,6 +294,14 @@
             "async": true
         },
         {
+            "name": "inspectBrowsingContext",
+            "description": "Inspect the specified browsing context using Web Inspector.",
+            "parameters": [
+                { "name": "handle", "$ref": "BrowsingContextHandle", "description": "The handle for the browsing context that should be inspected." }
+            ],
+            "async": true
+        },
+        {
             "name": "evaluateJavaScriptFunction",
             "description": "Evaluates a script function in a browsing context and calls it with the supplied arguments.",
             "parameters": [
diff --git a/Source/WebKit2/UIProcess/Automation/WebAutomationSession.cpp b/Source/WebKit2/UIProcess/Automation/WebAutomationSession.cpp
index 079cb1a..4716f7a 100644
--- a/Source/WebKit2/UIProcess/Automation/WebAutomationSession.cpp
+++ b/Source/WebKit2/UIProcess/Automation/WebAutomationSession.cpp
@@ -31,6 +31,7 @@
 #include "WebAutomationSessionMessages.h"
 #include "WebAutomationSessionProxyMessages.h"
 #include "WebCookieManagerProxy.h"
+#include "WebInspectorProxy.h"
 #include "WebProcessPool.h"
 #include <JavaScriptCore/InspectorBackendDispatcher.h>
 #include <JavaScriptCore/InspectorFrontendRouter.h>
@@ -432,12 +433,34 @@
     page->reload(reloadFromOrigin, contentBlockersEnabled);
 }
 
+void WebAutomationSession::inspectBrowsingContext(Inspector::ErrorString& errorString, const String& handle, Ref<InspectBrowsingContextCallback>&& callback)
+{
+    WebPageProxy* page = webPageProxyForHandle(handle);
+    if (!page)
+        FAIL_WITH_PREDEFINED_ERROR(WindowNotFound);
+
+    if (auto callback = m_pendingInspectorCallbacksPerPage.take(page->pageID()))
+        callback->sendFailure(STRING_FOR_PREDEFINED_ERROR_NAME(Timeout));
+    m_pendingInspectorCallbacksPerPage.set(page->pageID(), WTFMove(callback));
+
+    // Don't bring the inspector to front since this may be done automatically.
+    // We just want it loaded so it can pause if a breakpoint is hit during a command.
+    if (page->inspector())
+        page->inspector()->connect();
+}
+
 void WebAutomationSession::navigationOccurredForPage(const WebPageProxy& page)
 {
     if (auto callback = m_pendingNavigationInBrowsingContextCallbacksPerPage.take(page.pageID()))
         callback->sendSuccess(InspectorObject::create());
 }
 
+void WebAutomationSession::inspectorFrontendLoaded(const WebPageProxy& page)
+{
+    if (auto callback = m_pendingInspectorCallbacksPerPage.take(page.pageID()))
+        callback->sendSuccess(InspectorObject::create());
+}
+
 void WebAutomationSession::evaluateJavaScriptFunction(Inspector::ErrorString& errorString, const String& browsingContextHandle, const String* optionalFrameHandle, const String& function, const Inspector::InspectorArray& arguments, const bool* optionalExpectsImplicitCallbackArgument, const int* optionalCallbackTimeout, Ref<EvaluateJavaScriptFunctionCallback>&& callback)
 {
     WebPageProxy* page = webPageProxyForHandle(browsingContextHandle);
diff --git a/Source/WebKit2/UIProcess/Automation/WebAutomationSession.h b/Source/WebKit2/UIProcess/Automation/WebAutomationSession.h
index e5afd33..7ca6a1e 100644
--- a/Source/WebKit2/UIProcess/Automation/WebAutomationSession.h
+++ b/Source/WebKit2/UIProcess/Automation/WebAutomationSession.h
@@ -83,6 +83,7 @@
     void setProcessPool(WebProcessPool*);
 
     void navigationOccurredForPage(const WebPageProxy&);
+    void inspectorFrontendLoaded(const WebPageProxy&);
 
 #if ENABLE(REMOTE_INSPECTOR)
     // Inspector::RemoteAutomationTarget API
@@ -104,6 +105,7 @@
     void goBackInBrowsingContext(Inspector::ErrorString&, const String&, Ref<GoBackInBrowsingContextCallback>&&) override;
     void goForwardInBrowsingContext(Inspector::ErrorString&, const String&, Ref<GoForwardInBrowsingContextCallback>&&) override;
     void reloadBrowsingContext(Inspector::ErrorString&, const String&, Ref<ReloadBrowsingContextCallback>&&) override;
+    void inspectBrowsingContext(Inspector::ErrorString&, const String&, Ref<InspectBrowsingContextCallback>&&) override;
     void evaluateJavaScriptFunction(Inspector::ErrorString&, const String& browsingContextHandle, const String* optionalFrameHandle, const String& function, const Inspector::InspectorArray& arguments, const bool* optionalExpectsImplicitCallbackArgument, const int* optionalCallbackTimeout, Ref<Inspector::AutomationBackendDispatcherHandler::EvaluateJavaScriptFunctionCallback>&&) override;
     void performMouseInteraction(Inspector::ErrorString&, const String& handle, const Inspector::InspectorObject& requestedPosition, const String& mouseButton, const String& mouseInteraction, const Inspector::InspectorArray& keyModifiers, RefPtr<Inspector::Protocol::Automation::Point>& updatedPosition) override;
     void performKeyboardInteractions(Inspector::ErrorString&, const String& handle, const Inspector::InspectorArray& interactions) override;
@@ -176,6 +178,8 @@
 
     HashMap<uint64_t, RefPtr<Inspector::BackendDispatcher::CallbackBase>> m_pendingNavigationInBrowsingContextCallbacksPerPage;
 
+    HashMap<uint64_t, RefPtr<Inspector::BackendDispatcher::CallbackBase>> m_pendingInspectorCallbacksPerPage;
+
     uint64_t m_nextEvaluateJavaScriptCallbackID { 1 };
     HashMap<uint64_t, RefPtr<Inspector::AutomationBackendDispatcherHandler::EvaluateJavaScriptFunctionCallback>> m_evaluateJavaScriptFunctionCallbacks;