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..a360411584dd27779cc7f0a0347470835a070d22 100644
--- a/content/browser/gamepad/gamepad_service.h
+++ b/content/browser/gamepad/gamepad_service.h
@@ -15,6 +15,7 @@
 #include "base/threading/thread_checker.h"
 #include "content/common/content_export.h"
 #include "device/gamepad/gamepad_provider.h"
+#include "mojo/public/cpp/system/buffer.h"
 
 namespace blink {
 class WebGamepad;
@@ -74,6 +75,9 @@ class CONTENT_EXPORT GamepadService
   base::SharedMemoryHandle GetSharedMemoryHandleForProcess(
       base::ProcessHandle handle);
 
+  // Returns a new mojo::ScopedSharedBuffer handle of the gamepad data.
+  mojo::ScopedSharedBufferHandle GetSharedBufferHandle();
+
   // Stop/join with the background thread in GamepadProvider |provider_|.
   void Terminate();