Implement the gamepad API in the IPC proxy

content/browser/gamepad/platform_data_fetcher.h

-// Copyright (c) 2012 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-// Define the default data fetcher that GamepadProvider will use if none is
-// supplied. (GamepadPlatformDataFetcher).
-
-#ifndef CONTENT_BROWSER_GAMEPAD_PLATFORM_DATA_FETCHER_H_
-#define CONTENT_BROWSER_GAMEPAD_PLATFORM_DATA_FETCHER_H_
-
-#include "base/basictypes.h"
-#include "base/compiler_specific.h"
-#include "content/browser/gamepad/data_fetcher.h"
-
-#if defined(OS_WIN)
-#include "content/browser/gamepad/platform_data_fetcher_win.h"
-#elif defined(OS_MACOSX)
-#include "content/browser/gamepad/platform_data_fetcher_mac.h"
-#elif defined(OS_LINUX)
-#include "content/browser/gamepad/platform_data_fetcher_linux.h"
-#endif
-
-namespace content {
-
-#if defined(OS_WIN)
-
-typedef GamepadPlatformDataFetcherWin GamepadPlatformDataFetcher;
-
-#elif defined(OS_MACOSX)
-
-typedef GamepadPlatformDataFetcherMac GamepadPlatformDataFetcher;
-
-#elif defined(OS_LINUX)
-
-typedef GamepadPlatformDataFetcherLinux GamepadPlatformDataFetcher;
-
-#else
-
-class GamepadDataFetcherEmpty : public GamepadDataFetcher {
- public:
-  GamepadDataFetcherEmpty();
-
-  virtual void GetGamepadData(WebKit::WebGamepads* pads,
-                              bool devices_changed_hint) OVERRIDE;
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(GamepadDataFetcherEmpty);
-};
-typedef GamepadDataFetcherEmpty GamepadPlatformDataFetcher;
-
-#endif
-
-}  // namespace content
-
-#endif  // CONTENT_BROWSER_GAMEPAD_PLATFORM_DATA_FETCHER_H_