Add Mojo API for Blink hit testing

components/viz/host/host_frame_sink_manager.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 COMPONENTS_VIZ_HOST_HOST_FRAME_SINK_MANAGER_H_
 #define COMPONENTS_VIZ_HOST_HOST_FRAME_SINK_MANAGER_H_
 
 #include <memory>
 
 #include "base/compiler_specific.h"
@@ skipping 66 matching lines @@
                                   const FrameSinkId& child_frame_sink_id);
 
   // Unregisters FrameSink hierarchy. Client must have registered FrameSink
   // hierarchy before unregistering.
   void UnregisterFrameSinkHierarchy(const FrameSinkId& parent_frame_sink_id,
                                     const FrameSinkId& child_frame_sink_id);
 
   // CompositorFrameSinkSupportManager:
   std::unique_ptr<CompositorFrameSinkSupport> CreateCompositorFrameSinkSupport(
       CompositorFrameSinkSupportClient* client,
+      mojom::TargetFrameForInputDelegate*,
       const FrameSinkId& frame_sink_id,
       bool is_root,
       bool handles_frame_sink_id_invalidation,
       bool needs_sync_points) override;
 
  private:
   friend class test::HostFrameSinkManagerTest;
 
   struct FrameSinkData {
     FrameSinkData();
@@ skipping 16 matching lines @@
     // The FrameSinkId registered as the parent in the BeginFrame hierarchy.
     base::Optional<FrameSinkId> parent;
 
     // If a mojom::CompositorFrameSink was created for this FrameSinkId. This
     // will always be false if not using Mojo.
     bool has_created_compositor_frame_sink = false;
 
     // This will be null if using Mojo.
     CompositorFrameSinkSupport* support = nullptr;
 
+    // Hit test interface from the renderer.
+    mojom::TargetFrameForInputDelegate* target_frame_for_input_delegate =
+        nullptr;
+
    private:
     DISALLOW_COPY_AND_ASSIGN(FrameSinkData);
   };
 
   // Assigns the temporary reference to the frame sink that is expected to
   // embeded |surface_id|, otherwise drops the temporary reference.
   void PerformAssignTemporaryReference(const SurfaceId& surface_id);
 
   // mojom::FrameSinkManagerClient:
   void OnSurfaceCreated(const SurfaceInfo& surface_info) override;
@@ skipping 23 matching lines @@
   base::ObserverList<FrameSinkObserver> observers_;
 
   base::WeakPtrFactory<HostFrameSinkManager> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(HostFrameSinkManager);
 };
 
 }  // namespace viz
 
 #endif  // COMPONENTS_VIZ_HOST_HOST_FRAME_SINK_MANAGER_H_