Add support of Pause/Resume for polling thread

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
@@ skipping 195 matching lines @@
 
     virtual WebString convertIDNToUnicode(const WebString& host, const WebString& languages) { return host; }
 
 
     // IndexedDB ----------------------------------------------------------
 
     // Must return non-null.
     virtual WebIDBFactory* idbFactory() { return 0; }
 
 
+    // Resume Gamepad polling ----------------------------------------------
+
+    virtual void resumeGamepads() { }
+
+
+    // Pause Gamepad polling ------------------------------------------------
+
+    virtual void pauseGamepads() { }
+
     // Gamepad -------------------------------------------------------------
 
     virtual void sampleGamepads(WebGamepads& into) { into.length = 0; }
 
 
     // History -------------------------------------------------------------
 
     // Returns the hash for the given canonicalized URL for use in visited
     // link coloring.
     virtual unsigned long long visitedLinkHash(
@@ skipping 400 matching lines @@
     virtual WebDatabaseObserver* databaseObserver() { return 0; }
 
 
 protected:
     virtual ~Platform() { }
 };
 
 } // namespace blink
 
 #endif