[VSync Queue] Flush input in CommitComplete()

cc/trees/layer_tree_host_impl.cc

Index: cc/trees/layer_tree_host_impl.cc
diff --git a/cc/trees/layer_tree_host_impl.cc b/cc/trees/layer_tree_host_impl.cc
index 6965594181cb0a4dd868f89b7894ae6e36d2fdfa..e640020d75f46740c7ac6fe0a7f6bde3d1f53dda 100644
--- a/cc/trees/layer_tree_host_impl.cc
+++ b/cc/trees/layer_tree_host_impl.cc
@@ -1910,9 +1910,12 @@ void LayerTreeHostImpl::WillBeginImplFrame(const BeginFrameArgs& args) {
 
   for (auto* it : video_frame_controllers_)
     it->OnBeginFrame(args);
+
+  input_handler_state_ = InputHandlerState::INSIDE_IMPL_FRAME;
 }
 
 void LayerTreeHostImpl::DidFinishImplFrame() {
+  input_handler_state_ = InputHandlerState::IDLE;

[chongz, 2017/04/27 16:19:47]

Is this the right place, or should I put it in the start of
|LayerTreeHostImpl::DrawLayers()|?

   current_begin_frame_tracker_.Finish();
   decoded_image_tracker_.NotifyFrameFinished();
 }
@@ -2538,6 +2541,11 @@ void LayerTreeHostImpl::BindToClient(InputHandlerClient* client,
   touchpad_and_wheel_scroll_latching_enabled_ = wheel_scroll_latching_enabled;
 }
 
+InputHandler::InputHandlerState LayerTreeHostImpl::GetInputHandlerState()
+    const {
+  return input_handler_state_;
+};
+
 InputHandler::ScrollStatus LayerTreeHostImpl::TryScroll(
     const gfx::PointF& screen_space_point,
     InputHandler::ScrollInputType type,