Add Mojo API for Blink hit testing

content/renderer/input/frame_input_handler_impl.h

Index: content/renderer/input/frame_input_handler_impl.h
diff --git a/content/renderer/input/frame_input_handler_impl.h b/content/renderer/input/frame_input_handler_impl.h
index 705f8161d13a6733ad14bd00f3df7d3db4db32c6..b271e37140eeda007d6a41d49696b24a5a10419f 100644
--- a/content/renderer/input/frame_input_handler_impl.h
+++ b/content/renderer/input/frame_input_handler_impl.h
@@ -88,10 +88,11 @@ class FrameInputHandlerImpl : public mojom::FrameInputHandler {
   FrameInputHandlerImpl(base::WeakPtr<RenderFrameImpl> render_frame,
                         mojom::FrameInputHandlerRequest request);
 
-  void RunOnMainThread(const base::Closure& closure);
+  void RunOnMainThread(base::OnceClosure closure);
   void BindNow(mojom::FrameInputHandlerRequest request);
   void ExecuteCommandOnMainThread(const std::string& command,
                                   UpdateState state);
+
   void Release();
 
   mojo::Binding<mojom::FrameInputHandler> binding_;