Convert Gamepad IPC messages into mojo interface.

content/browser/gamepad/gamepad_service.h

Index: content/browser/gamepad/gamepad_service.h
diff --git a/content/browser/gamepad/gamepad_service.h b/content/browser/gamepad/gamepad_service.h
index b32b42d93030512d76baf16a086a2c8f0f327b46..75d9cb7e05973dce06696eb9c6de369138849ad9 100644
--- a/content/browser/gamepad/gamepad_service.h
+++ b/content/browser/gamepad/gamepad_service.h
@@ -74,6 +74,9 @@ class CONTENT_EXPORT GamepadService
   base::SharedMemoryHandle GetSharedMemoryHandleForProcess(
       base::ProcessHandle handle);
 
+  // Returns the shared memory handle of the gamepad data.
+  base::SharedMemoryHandle GetSharedMemoryHandle();

[blundell, 2016/12/05 15:22:34]

Ah, I just thought of something even better: This method should just return the
handle as a Mojo handle rather than a base::SharedMemoryHandle. So,
GetSharedBufferHandle(). Then I would put the TODO and bug reference about
moving everything to Mojo in the comment on this method.

[ke.he, 2016/12/06 09:51:27]

Done.

+
   // Stop/join with the background thread in GamepadProvider |provider_|.
   void Terminate();