Factor out GamepadCommon base class from Gamepad and WebKitGamepad

Source/modules/gamepad/GamepadList.h

 /*
  * Copyright (C) 2011, 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
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 29 matching lines @@
 public:
     static PassRefPtrWillBeRawPtr<GamepadList> create() { return adoptRefWillBeNoop(new GamepadList); }
     ~GamepadList();
 
     void set(unsigned index, PassRefPtrWillBeRawPtr<Gamepad>);
     Gamepad* item(unsigned index);
     unsigned length() const;
 
     void trace(Visitor*);
 
-private:
+protected:
+    // inherited by WebKitGamepadList
     GamepadList()
     {
         ScriptWrappable::init(this);
     }
 
+private:
+    // WebKitGamepadList items are of type WebKitGamepad, not Gamepad

[haraken, 2014/03/13 07:08:50]

Remove this comment. Or move the comment to WebKitGamepad::items.

     RefPtrWillBeMember<Gamepad> m_items[blink::WebGamepads::itemsLengthCap];
 };
 
 } // namespace WebCore
 
 #endif // GamepadList_h