Implement the gamepad API in the IPC proxy

content/browser/gamepad/platform_data_fetcher_linux.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_LINUX_H_
-#define CONTENT_BROWSER_GAMEPAD_PLATFORM_DATA_FETCHER_LINUX_H_
-
-#include <string>
-
-#include "base/basictypes.h"
-#include "base/compiler_specific.h"
-#include "base/memory/scoped_ptr.h"
-#include "content/browser/gamepad/data_fetcher.h"
-#include "content/browser/gamepad/gamepad_standard_mappings.h"
-#include "third_party/WebKit/Source/WebKit/chromium/public/platform/WebGamepads.h"
-
-extern "C" {
-struct udev_device;
-}
-
-namespace content {
-
-class UdevLinux;
-
-class GamepadPlatformDataFetcherLinux : public GamepadDataFetcher {
- public:
-  GamepadPlatformDataFetcherLinux();
-  virtual ~GamepadPlatformDataFetcherLinux();
-
-  // GamepadDataFetcher implementation.
-  virtual void GetGamepadData(WebKit::WebGamepads* pads,
-                              bool devices_changed_hint) OVERRIDE;
-
- private:
-  void RefreshDevice(udev_device* dev);
-  void EnumerateDevices();
-  void ReadDeviceData(size_t index);
-
-  // File descriptors for the /dev/input/js* devices. -1 if not in use.
-  int device_fds_[WebKit::WebGamepads::itemsLengthCap];
-
-  // Functions to map from device data to standard layout, if available. May
-  // be null if no mapping is available.
-  GamepadStandardMappingFunction mappers_[WebKit::WebGamepads::itemsLengthCap];
-
-  // Data that's returned to the consumer.
-  WebKit::WebGamepads data_;
-
-  scoped_ptr<UdevLinux> udev_;
-
-  DISALLOW_COPY_AND_ASSIGN(GamepadPlatformDataFetcherLinux);
-};
-
-}  // namespace content
-
-#endif  // CONTENT_BROWSER_GAMEPAD_PLATFORM_DATA_FETCHER_LINUX_H_