Add Mojo API for Blink hit testing

content/browser/renderer_host/render_widget_host_impl.h

 // Copyright (c) 2012 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_RENDERER_HOST_RENDER_WIDGET_HOST_IMPL_H_
 #define CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_IMPL_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 551 matching lines @@
   // changes, or when the text selection changes inside a frame. If both fields
   // are false, RenderWidget will not send any updates. To avoid sending
   // unnecessary IPCs to RenderWidget (e.g., asking for monitor updates while
   // we are already receiving updates), when
   // |monitoring_composition_info_| == |monitor_updates| no IPC is sent to the
   // renderer unless it is for an immediate request.
   void RequestCompositionUpdates(bool immediate_request, bool monitor_updates);
 
   void RequestCompositorFrameSink(
       viz::mojom::CompositorFrameSinkRequest request,
-      viz::mojom::CompositorFrameSinkClientPtr client);
+      viz::mojom::CompositorFrameSinkClientPtr client,
+      viz::mojom::TargetFrameForInputDelegatePtr hit_test);
 
   const cc::CompositorFrameMetadata& last_frame_metadata() {
     return last_frame_metadata_;
   }
 
   bool HasGestureStopped() override;
 
   // viz::mojom::CompositorFrameSink implementation.
   void SetNeedsBeginFrame(bool needs_begin_frame) override;
   void SubmitCompositorFrame(const viz::LocalSurfaceId& local_surface_id,
@@ skipping 387 matching lines @@
 #endif
 
   // These information are used to verify that the renderer does not misbehave
   // when it comes to allocating LocalSurfaceIds. If surface properties change,
   // a new LocalSurfaceId must be created.
   viz::LocalSurfaceId last_local_surface_id_;
   RenderWidgetSurfaceProperties last_surface_properties_;
 
   mojo::Binding<viz::mojom::CompositorFrameSink> compositor_frame_sink_binding_;
   viz::mojom::CompositorFrameSinkClientPtr renderer_compositor_frame_sink_;
+  viz::mojom::TargetFrameForInputDelegatePtr target_frame_for_input_delegate_;
 
   cc::CompositorFrameMetadata last_frame_metadata_;
 
   // Last non-zero frame token received from the renderer. Any swap messsages
   // having a token less than or equal to this value will be processed.
   uint32_t last_received_frame_token_ = 0;
 
   // List of all swap messages that their corresponding frames have not arrived.
   // Sorted by frame token.
   std::queue<std::pair<uint32_t, std::vector<IPC::Message>>> queued_messages_;
 
   // If a CompositorFrame is submitted that references SharedBitmaps that don't
   // exist yet, we keep it here until they are available.
   struct {
     viz::LocalSurfaceId local_surface_id;
     cc::CompositorFrame frame;
     uint32_t max_shared_bitmap_sequence_number = 0;
   } saved_frame_;
 
   std::unique_ptr<LegacyIPCWidgetInputHandler> legacy_widget_input_handler_;
 
   base::WeakPtrFactory<RenderWidgetHostImpl> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderWidgetHostImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_IMPL_H_