Implement the gamepad API in the IPC proxy

content/browser/gamepad/gamepad_data_fetcher.h

+// Copyright (c) 2011 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_DATA_FETCHER_H_
+#define CONTENT_BROWSER_GAMEPAD_GAMEPAD_DATA_FETCHER_H_
+
+namespace WebKit {
+class WebGamepads;
+}
+
+namespace content {
+
+// Abstract interface for imlementing platform- (and test-) specific behaviro
+// for getting the gamepad data.
+class GamepadDataFetcher {
+ public:
+  virtual ~GamepadDataFetcher() {}
+  virtual void GetGamepadData(WebKit::WebGamepads* pads,
+                              bool devices_changed_hint) = 0;
+  virtual void PauseHint(bool paused) {}
+};
+
+}  // namespace content
+
+#endif  // CONTENT_BROWSER_GAMEPAD_GAMEPAD_DATA_FETCHER_H_