Convert Gamepad IPC messages into mojo interface.

content/browser/gamepad/gamepad_service.cc

Index: content/browser/gamepad/gamepad_service.cc
diff --git a/content/browser/gamepad/gamepad_service.cc b/content/browser/gamepad/gamepad_service.cc
index a742cc817f645fe716acfc81fc5ba60c39aac51e..8450fe713b57da55032e3aa561c41e11731655a0 100644
--- a/content/browser/gamepad/gamepad_service.cc
+++ b/content/browser/gamepad/gamepad_service.cc
@@ -11,11 +11,13 @@
 #include "base/memory/ptr_util.h"
 #include "base/memory/singleton.h"
 #include "content/browser/gamepad/gamepad_shared_buffer_impl.h"
+#include "content/common/gamepad_hardware_buffer.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/render_process_host.h"
 #include "device/gamepad/gamepad_consumer.h"
 #include "device/gamepad/gamepad_data_fetcher.h"
 #include "device/gamepad/gamepad_provider.h"
+#include "mojo/public/cpp/system/platform_handle.h"
 
 namespace content {
 
@@ -153,6 +155,16 @@ base::SharedMemoryHandle GamepadService::GetSharedMemoryHandleForProcess(
   return provider_->GetSharedMemoryHandleForProcess(handle);
 }
 
+mojo::ScopedSharedBufferHandle GamepadService::GetSharedBufferHandle() {
+  DCHECK(thread_checker_.CalledOnValidThread());
+
+  // TODO(heke): Use mojo::SharedBuffer rather than base::SharedMemory in
+  // GamepadSharedBuffer. See crbug.com/670655 for details.
+  return mojo::WrapSharedMemoryHandle(provider_->GetSharedMemoryHandle(),
+                                      sizeof(GamepadHardwareBuffer),
+                                      true /* read_only */);
+}
+
 void GamepadService::OnUserGesture() {
   DCHECK(thread_checker_.CalledOnValidThread());