WIP Hittest Component.

components/viz/frame_sinks/gpu_root_compositor_frame_sink.cc

Index: components/viz/frame_sinks/gpu_root_compositor_frame_sink.cc
diff --git a/components/viz/frame_sinks/gpu_root_compositor_frame_sink.cc b/components/viz/frame_sinks/gpu_root_compositor_frame_sink.cc
index 393f53fc2eb7d7d1b55226c84b1b895e1bfcf9d8..e380fe5078776c11e45ef373ddc61afb3b949472 100644
--- a/components/viz/frame_sinks/gpu_root_compositor_frame_sink.cc
+++ b/components/viz/frame_sinks/gpu_root_compositor_frame_sink.cc
@@ -114,7 +114,9 @@ void GpuRootCompositorFrameSink::DisplayOutputSurfaceLost() {
 
 void GpuRootCompositorFrameSink::DisplayWillDrawAndSwap(
     bool will_draw_and_swap,
-    const cc::RenderPassList& render_pass) {}
+    const cc::RenderPassList& render_pass) {
+  hit_test_aggregator_.Aggregate(display_->CurrentSurfaceId());
+}
 
 void GpuRootCompositorFrameSink::DisplayDidDrawAndSwap() {}
 
@@ -125,6 +127,7 @@ void GpuRootCompositorFrameSink::DidReceiveCompositorFrameAck(
 }
 
 void GpuRootCompositorFrameSink::OnBeginFrame(const cc::BeginFrameArgs& args) {
+  hit_test_aggregator_.Swap();
   if (client_)
     client_->OnBeginFrame(args);
 }