Introduce a basic Blink Scheduler

public/platform/Platform.h

 /*
  * 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:
  *
  *     * 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
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 class WebMediaStreamCenter;
 class WebMediaStreamCenterClient;
 class WebMessagePortChannel;
 class WebMimeRegistry;
 class WebPluginListBuilder;
 class WebPrescientNetworking;
 class WebPublicSuffixList;
 class WebRTCPeerConnectionHandler;
 class WebRTCPeerConnectionHandlerClient;
 class WebSandboxSupport;
+class WebScheduler;
 class WebScrollbarBehavior;
 class WebSocketHandle;
 class WebSocketStreamHandle;
 class WebSpeechSynthesizer;
 class WebSpeechSynthesizerClient;
 class WebStorageNamespace;
 struct WebFloatPoint;
 class WebThemeEngine;
 class WebThread;
 class WebURL;
@@ skipping 545 matching lines @@
     virtual WebDatabaseObserver* databaseObserver() { return 0; }
 
 
 protected:
     virtual ~Platform() { }
 };
 
 } // namespace blink
 
 #endif