Implement compositor thread VSync aligned event queue

cc/trees/layer_tree_host_impl.cc

 // Copyright 2011 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.
 
 #include "cc/trees/layer_tree_host_impl.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <algorithm>
@@ skipping 1811 matching lines @@
 void LayerTreeHostImpl::WillBeginImplFrame(const BeginFrameArgs& args) {
   current_begin_frame_tracker_.Start(args);
 
   if (is_likely_to_require_a_draw_) {
     // Optimistically schedule a draw. This will let us expect the tile manager
     // to complete its work so that we can draw new tiles within the impl frame
     // we are beginning now.
     SetNeedsRedraw();
   }
 
+  if (input_handler_client_)
+    input_handler_client_->DeliverInputForBeginFrame();
+
   Animate();
 
   for (auto* it : video_frame_controllers_)
     it->OnBeginFrame(args);
 }
 
 void LayerTreeHostImpl::DidFinishImplFrame() {
   current_begin_frame_tracker_.Finish();
 }
 
@@ skipping 2233 matching lines @@
       worker_context_visibility_ =
           worker_context->CacheController()->ClientBecameVisible();
     } else {
       worker_context->CacheController()->ClientBecameNotVisible(
           std::move(worker_context_visibility_));
     }
   }
 }
 
 }  // namespace cc