Convert Gamepad IPC messages into mojo interface.

device/gamepad/gamepad_provider.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 DEVICE_GAMEPAD_GAMEPAD_PROVIDER_H_
 #define DEVICE_GAMEPAD_GAMEPAD_PROVIDER_H_
 
 #include <memory>
 #include <utility>
 #include <vector>
@@ skipping 40 matching lines @@
       GamepadConnectionChangeClient* connection_change_client,
       std::unique_ptr<GamepadDataFetcher> fetcher);
 
   ~GamepadProvider() override;
 
   // Returns the shared memory handle of the gamepad data duplicated into the
   // given process.
   base::SharedMemoryHandle GetSharedMemoryHandleForProcess(
       base::ProcessHandle renderer_process);
 
+  // Returns the shared memory handle of the gamepad data.

[blundell, 2016/12/06 12:26:50]

Could you add a TODO and bug to follow up by moving gamepad_hardware_buffer.h
into //device/gamepad and then change this method to talk Mojo instead of
base::SharedMemoryHandle?

[ke.he, 2016/12/07 08:05:10]

Done.

+  base::SharedMemoryHandle GetSharedMemoryHandle();
+
   void AddGamepadDataFetcher(GamepadDataFetcher* fetcher);
   void RemoveGamepadDataFetcher(GamepadDataFetcher* fetcher);
 
   void GetCurrentGamepadData(blink::WebGamepads* data);
 
   // Pause and resume the background polling thread. Can be called from any
   // thread.
   void Pause();
   void Resume();
 
@@ skipping 87 matching lines @@
   std::unique_ptr<base::Thread> polling_thread_;
 
   GamepadConnectionChangeClient* connection_change_client_;
 
   DISALLOW_COPY_AND_ASSIGN(GamepadProvider);
 };
 
 }  // namespace device
 
 #endif  // DEVICE_GAMEPAD_GAMEPAD_PROVIDER_H_