Run Mutation Observer and Custom Element callbacks consistently at microtask checkpoint

Source/WebKit/chromium/src/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 20 matching lines @@
 #include "config.h"
 #include "WebKit.h"
 
 #include "IDBFactoryBackendProxy.h"
 #include "RuntimeEnabledFeatures.h"
 #include "WebMediaPlayerClientImpl.h"
 #include "WebWorkerClientImpl.h"
 #include "bindings/v8/V8Binding.h"
 #include "bindings/v8/V8RecursionScope.h"
 #include "core/Init.h"
-#include "core/dom/CustomElementRegistry.h"
-#include "core/dom/MutationObserver.h"
+#include "core/dom/Microtask.h"
 #include "core/page/Frame.h"
 #include "core/page/Page.h"
 #include "core/page/Settings.h"
 #include "core/platform/LayoutTestSupport.h"
 #include "core/platform/Logging.h"
 #include "core/platform/graphics/MediaPlayer.h"
 #include "core/platform/graphics/chromium/ImageDecodingStore.h"
 #include "core/workers/WorkerContextProxy.h"
 #include "wtf/Assertions.h"
 #include "wtf/CryptographicallyRandomNumber.h"
@@ skipping 10 matching lines @@
 
 namespace WebKit {
 
 namespace {
 
 class EndOfTaskRunner : public WebThread::TaskObserver {
 public:
     virtual void willProcessTask() { }
     virtual void didProcessTask()
     {
-        WebCore::CustomElementRegistry::deliverAllLifecycleCallbacks();
-        WebCore::MutationObserver::deliverAllMutations();
+        WebCore::Microtask::performCheckpoint();
     }
 };
 
 } // namespace
 
 static WebThread::TaskObserver* s_endOfTaskRunner = 0;
 
 // Make sure we are not re-initialized in the same address space.
 // Doing so may cause hard to reproduce crashes.
 static bool s_webKitInitialized = false;
@@ skipping 123 matching lines @@
     UNUSED_PARAM(name);
 #endif // !LOG_DISABLED
 }
 
 void resetPluginCache(bool reloadPages)
 {
     WebCore::Page::refreshPlugins(reloadPages);
 }
 
 } // namespace WebKit