Implement the gamepad API in the IPC proxy

content/browser/gamepad/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_GAMEPAD_PLATFORM_DATA_FETCHER_LINUX_H_
+#define CONTENT_BROWSER_GAMEPAD_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/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_GAMEPAD_PLATFORM_DATA_FETCHER_LINUX_H_