Revert of Remove WindowFocusAllowedIndicator and associated code.

Source/core/dom/ExecutionContext.cpp

 /*
  * Copyright (C) 2008 Apple Inc. All Rights Reserved.
  * Copyright (C) 2012 Google 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
@@ skipping 18 matching lines @@
 #include "core/dom/ExecutionContext.h"
 
 #include "core/dom/AddConsoleMessageTask.h"
 #include "core/dom/ContextLifecycleNotifier.h"
 #include "core/dom/ExecutionContextTask.h"
 #include "core/events/ErrorEvent.h"
 #include "core/events/EventTarget.h"
 #include "core/html/PublicURLManager.h"
 #include "core/inspector/InspectorInstrumentation.h"
 #include "core/inspector/ScriptCallStack.h"
+#include "core/page/WindowFocusAllowedIndicator.h"
 #include "core/workers/WorkerGlobalScope.h"
 #include "core/workers/WorkerThread.h"
 #include "wtf/MainThread.h"
 
 namespace blink {
 
 class ExecutionContext::PendingException : public NoBaseWillBeGarbageCollectedFinalized<ExecutionContext::PendingException> {
     WTF_MAKE_NONCOPYABLE(PendingException);
 public:
     PendingException(const String& errorMessage, int lineNumber, int columnNumber, int scriptId, const String& sourceURL, PassRefPtrWillBeRawPtr<ScriptCallStack> callStack)
@@ skipping 230 matching lines @@
 
 void ExecutionContext::consumeWindowFocus()
 {
     if (m_windowFocusTokens == 0)
         return;
     --m_windowFocusTokens;
 }
 
 bool ExecutionContext::isWindowFocusAllowed() const
 {
-    return m_windowFocusTokens > 0;
+    // FIXME: WindowFocusAllowedIndicator::windowFocusAllowed() is temporary,
+    // it will be removed as soon as WebScopedWindowFocusAllowedIndicator will
+    // be updated to not use WindowFocusAllowedIndicator.
+    return m_windowFocusTokens > 0 || WindowFocusAllowedIndicator::windowFocusAllowed();
 }
 
 void ExecutionContext::trace(Visitor* visitor)
 {
 #if ENABLE(OILPAN)
     visitor->trace(m_pendingExceptions);
     visitor->trace(m_publicURLManager);
     visitor->trace(m_timeouts);
     HeapSupplementable<ExecutionContext>::trace(visitor);
 #endif
     LifecycleContext<ExecutionContext>::trace(visitor);
 }
 
 } // namespace blink