Convert Gamepad IPC messages into mojo interface.

device/gamepad/gamepad_provider.h

Index: device/gamepad/gamepad_provider.h
diff --git a/device/gamepad/gamepad_provider.h b/device/gamepad/gamepad_provider.h
index faed53d5bc883a9c51f987f244f44e516b0ec794..9c9d3d6503c2eb1ff7aebbdf85c98869db3c2bd3 100644
--- a/device/gamepad/gamepad_provider.h
+++ b/device/gamepad/gamepad_provider.h
@@ -58,6 +58,9 @@ class DEVICE_GAMEPAD_EXPORT GamepadProvider
   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);