Implement scroll handler latency tracking

cc/trees/thread_proxy.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/thread_proxy.h"
 
 #include <algorithm>
 #include <string>
 
 #include "base/auto_reset.h"
@@ skipping 748 matching lines @@
   // the apply/animate/layout part of the BeginMainFrameAndCommit process since
   // those commit requests will get painted immediately. Once we have done
   // the paint, main().commit_requested will be set to false to allow new commit
   // requests to be scheduled.
   // On the other hand, the animate_requested flag should remain cleared
   // here so that any animation requests generated by the apply or animate
   // callbacks will trigger another frame.
   main().commit_requested = true;
   main().commit_request_sent_to_impl_thread = true;
 
-  layer_tree_host()->ApplyScrollAndScale(*begin_main_frame_state->scroll_info);
+  layer_tree_host()->ApplyScrollAndScale(
+      begin_main_frame_state->scroll_info.get());
 
   layer_tree_host()->WillBeginMainFrame();
 
   layer_tree_host()->UpdateClientAnimations(
       begin_main_frame_state->monotonic_frame_begin_time);
   layer_tree_host()->AnimateLayers(
       begin_main_frame_state->monotonic_frame_begin_time);
   blocked_main().last_monotonic_frame_begin_time =
       begin_main_frame_state->monotonic_frame_begin_time;
 
@@ skipping 610 matching lines @@
 
   impl().timing_history.DidActivateSyncTree();
 }
 
 void ThreadProxy::DidManageTiles() {
   DCHECK(IsImplThread());
   impl().scheduler->DidManageTiles();
 }
 
 }  // namespace cc