Web Animations: Timeline should not advance during task execution

Source/web/WebKit.cpp

 /*
  * Copyright (C) 2009 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 17 matching lines @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #include "config.h"
 #include "public/web/WebKit.h"
 
 #include "RuntimeEnabledFeatures.h"
 #include "bindings/v8/V8Binding.h"
 #include "bindings/v8/V8Initializer.h"
 #include "core/Init.h"
+#include "core/animation/AnimationClock.h"
 #include "core/dom/Microtask.h"
 #include "core/frame/Settings.h"
 #include "core/page/Page.h"
 #include "core/workers/WorkerGlobalScopeProxy.h"
 #include "gin/public/v8_platform.h"
 #include "modules/InitModules.h"
 #include "platform/LayoutTestSupport.h"
 #include "platform/Logging.h"
 #include "platform/graphics/ImageDecodingStore.h"
 #include "platform/graphics/media/MediaPlayer.h"
@@ skipping 12 matching lines @@
 #include "wtf/text/AtomicString.h"
 #include "wtf/text/TextEncoding.h"
 #include <v8.h>
 
 namespace blink {
 
 namespace {
 
 class EndOfTaskRunner : public WebThread::TaskObserver {
 public:
-    virtual void willProcessTask() { }
-    virtual void didProcessTask()
+    virtual void willProcessTask() OVERRIDE
+    {
+        WebCore::AnimationClock::notifyTaskStart();
+    }
+    virtual void didProcessTask() OVERRIDE
     {
         WebCore::Microtask::performCheckpoint();
     }
 };
 
 } // namespace
 
 static WebThread::TaskObserver* s_endOfTaskRunner = 0;
 static WebThread::TaskObserver* s_pendingGCRunner = 0;
 static WebCore::ThreadState::Interruptor* s_messageLoopInterruptor = 0;
@@ skipping 178 matching lines @@
         channel->state = WTFLogChannelOn;
 #endif // !LOG_DISABLED
 }
 
 void resetPluginCache(bool reloadPages)
 {
     WebCore::Page::refreshPlugins(reloadPages);
 }
 
 } // namespace blink