Add Mojo API for Blink hit testing

content/browser/renderer_host/frame_sink_provider_impl.h

 // Copyright 2017 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_RENDER_WIDGET_COMPOSITOR_FRAME_SINK_PROVIDER_H_
 #define CONTENT_BROWSER_RENDER_WIDGET_COMPOSITOR_FRAME_SINK_PROVIDER_H_
 
 #include "content/common/frame_sink_provider.mojom.h"
 #include "mojo/public/cpp/bindings/binding.h"
 
 namespace content {
 
 // This class lives in the browser and provides CompositorFrameSink for the
 // renderer.
 class FrameSinkProviderImpl : public mojom::FrameSinkProvider {
  public:
   explicit FrameSinkProviderImpl(int32_t process_id);
   ~FrameSinkProviderImpl() override;
 
   void Bind(mojom::FrameSinkProviderRequest request);
   void Unbind();
 
   // mojom::FrameSinkProvider implementation.
   void CreateForWidget(
       int32_t widget_id,
       viz::mojom::CompositorFrameSinkRequest request,
-      viz::mojom::CompositorFrameSinkClientPtr client) override;
+      viz::mojom::CompositorFrameSinkClientPtr client,
+      viz::mojom::TargetFrameForInputDelegatePtr input_delegate) override;
 
  private:
   const int32_t process_id_;
   mojo::Binding<mojom::FrameSinkProvider> binding_;
 
   DISALLOW_COPY_AND_ASSIGN(FrameSinkProviderImpl);
 };
 
 }  // namespace content
 
 #endif  //  CONTENT_BROWSER_RENDER_WIDGET_COMPOSITOR_FRAME_SINK_PROVIDER_H_