Implement the gamepad API in the IPC proxy

content/browser/gamepad/platform_data_fetcher_win.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.
-
-#ifndef CONTENT_BROWSER_GAMEPAD_PLATFORM_DATA_FETCHER_WIN_H_
-#define CONTENT_BROWSER_GAMEPAD_PLATFORM_DATA_FETCHER_WIN_H_
-
-#include "build/build_config.h"
-
-#ifndef WIN32_LEAN_AND_MEAN
-#define WIN32_LEAN_AND_MEAN
-#endif
-#include <windows.h>
-#include <XInput.h>
-
-#include "base/basictypes.h"
-#include "base/compiler_specific.h"
-#include "base/scoped_native_library.h"
-#include "content/browser/gamepad/data_fetcher.h"
-
-namespace content {
-
-class GamepadPlatformDataFetcherWin : public GamepadDataFetcher {
- public:
-  GamepadPlatformDataFetcherWin();
-  virtual ~GamepadPlatformDataFetcherWin();
-  virtual void GetGamepadData(WebKit::WebGamepads* pads,
-                              bool devices_changed_hint) OVERRIDE;
- private:
-  // The three function types we use from xinput1_3.dll.
-  typedef void (WINAPI *XInputEnableFunc)(BOOL enable);
-  typedef DWORD (WINAPI *XInputGetCapabilitiesFunc)(
-    DWORD dwUserIndex, DWORD dwFlags, XINPUT_CAPABILITIES* pCapabilities);
-  typedef DWORD (WINAPI *XInputGetStateFunc)(
-      DWORD dwUserIndex, XINPUT_STATE* pState);
-
-  // Get functions from dynamically loaded xinput1_3.dll. We don't use
-  // DELAYLOAD because the import library for Win8 SDK pulls xinput1_4 which
-  // isn't redistributable. Returns true if loading was successful. We include
-  // xinput1_3.dll with Chrome.
-  bool GetXinputDllFunctions();
-
-  base::ScopedNativeLibrary xinput_dll_;
-  bool xinput_available_;
-
-  // Function pointers to XInput functionality, retrieved in
-  // |GetXinputDllFunctions|.
-  XInputEnableFunc xinput_enable_;
-  XInputGetCapabilitiesFunc xinput_get_capabilities_;
-  XInputGetStateFunc xinput_get_state_;
-
-  DISALLOW_COPY_AND_ASSIGN(GamepadPlatformDataFetcherWin);
-};
-
-}  // namespace content
-
-#endif  // CONTENT_BROWSER_GAMEPAD_PLATFORM_DATA_FETCHER_WIN_H_