Convert Gamepad IPC messages into mojo interface.

content/browser/gamepad/gamepad_service.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_SERVICE_H_
 #define CONTENT_BROWSER_GAMEPAD_GAMEPAD_SERVICE_H_
 
 #include <memory>
 #include <set>
 
@@ skipping 56 matching lines @@
   // Registers the given closure for calling when the user has interacted with
   // the device. This callback will only be issued once. Should only be called
   // while a consumer is active.
   void RegisterForUserGesture(const base::Closure& closure);
 
   // Returns the shared memory handle of the gamepad data duplicated into the
   // given process.
   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();
 
   // Called on IO thread when a gamepad is connected.
   void OnGamepadConnected(int index, const blink::WebGamepad& pad);
 
   // Called on IO thread when a gamepad is disconnected.
   void OnGamepadDisconnected(int index, const blink::WebGamepad& pad);
 
  private:
@@ skipping 43 matching lines @@
   int num_active_consumers_;
 
   bool gesture_callback_pending_;
 
   DISALLOW_COPY_AND_ASSIGN(GamepadService);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_GAMEPAD_GAMEPAD_SERVICE_H_