Convert Gamepad IPC messages into mojo interface.

device/gamepad/gamepad_provider.cc

Index: device/gamepad/gamepad_provider.cc
diff --git a/device/gamepad/gamepad_provider.cc b/device/gamepad/gamepad_provider.cc
index 701e0a41f073a1131bd2dfa13cbad0bccc564598..024fdba39ab146e98f95c5b172e645d99bb43576 100644
--- a/device/gamepad/gamepad_provider.cc
+++ b/device/gamepad/gamepad_provider.cc
@@ -94,6 +94,11 @@ base::SharedMemoryHandle GamepadProvider::GetSharedMemoryHandleForProcess(
   return renderer_handle;
 }
 
+base::SharedMemoryHandle GamepadProvider::GetSharedMemoryHandle() {
+  return base::SharedMemory::DuplicateHandle(
+      gamepad_shared_buffer_->shared_memory()->handle());
+}
+
 void GamepadProvider::GetCurrentGamepadData(WebGamepads* data) {
   const WebGamepads* pads = gamepad_shared_buffer_->buffer();
   base::AutoLock lock(shared_memory_lock_);