Use HitTestAggregator in GpuRootCompositorFrameSink

components/viz/service/frame_sinks/gpu_root_compositor_frame_sink.h

Index: components/viz/service/frame_sinks/gpu_root_compositor_frame_sink.h
diff --git a/components/viz/service/frame_sinks/gpu_root_compositor_frame_sink.h b/components/viz/service/frame_sinks/gpu_root_compositor_frame_sink.h
index 2defc9d828a34bc72306f9adf468877a6b277bc2..9ac1a81ae78c57cf7b8baa5bc164fb8c9babd3a6 100644
--- a/components/viz/service/frame_sinks/gpu_root_compositor_frame_sink.h
+++ b/components/viz/service/frame_sinks/gpu_root_compositor_frame_sink.h
@@ -11,9 +11,11 @@
 #include "cc/ipc/frame_sink_manager.mojom.h"
 #include "components/viz/common/surfaces/local_surface_id.h"
 #include "components/viz/common/surfaces/surface_id.h"
+#include "components/viz/common/switches.h"
 #include "components/viz/service/display/display_client.h"
 #include "components/viz/service/frame_sinks/compositor_frame_sink_support_client.h"
 #include "components/viz/service/frame_sinks/gpu_compositor_frame_sink_delegate.h"
+#include "components/viz/service/hit_test/hit_test_aggregator.h"
 #include "mojo/public/cpp/bindings/associated_binding.h"
 #include "mojo/public/cpp/bindings/binding.h"
 
@@ -101,6 +103,8 @@ class GpuRootCompositorFrameSink
       compositor_frame_sink_private_binding_;
   mojo::AssociatedBinding<cc::mojom::DisplayPrivate> display_private_binding_;
 
+  std::unique_ptr<HitTestAggregator> hit_test_aggregator_;
+
   DISALLOW_COPY_AND_ASSIGN(GpuRootCompositorFrameSink);
 };