Fix scrollbar fade animation scheduling.

cc/trees/layer_tree_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_impl.h"
 
 #include "base/debug/trace_event.h"
 #include "cc/animation/keyframed_animation_curve.h"
 #include "cc/animation/scrollbar_animation_controller.h"
 #include "cc/debug/traced_value.h"
@@ skipping 138 matching lines @@
   return currently_scrolling_layer_;
 }
 
 void LayerTreeImpl::SetCurrentlyScrollingLayer(LayerImpl* layer) {
   if (currently_scrolling_layer_ == layer)
     return;
 
   if (currently_scrolling_layer_ &&
       currently_scrolling_layer_->scrollbar_animation_controller())
     currently_scrolling_layer_->scrollbar_animation_controller()->
-        DidScrollGestureEnd(CurrentFrameTimeTicks());
+        DidScrollGestureEnd(CurrentPhysicalTimeTicks());
   currently_scrolling_layer_ = layer;
   if (layer && layer->scrollbar_animation_controller())
     layer->scrollbar_animation_controller()->DidScrollGestureBegin();
 }
 
 void LayerTreeImpl::ClearCurrentlyScrollingLayer() {
   SetCurrentlyScrollingLayer(NULL);
   scrolling_layer_id_from_previous_tree_ = 0;
 }
 
@@ skipping 291 matching lines @@
 }
 
 base::TimeTicks LayerTreeImpl::CurrentFrameTimeTicks() const {
   return layer_tree_host_impl_->CurrentFrameTimeTicks();
 }
 
 base::Time LayerTreeImpl::CurrentFrameTime() const {
   return layer_tree_host_impl_->CurrentFrameTime();
 }
 
+base::TimeTicks LayerTreeImpl::CurrentPhysicalTimeTicks() const {
+  return layer_tree_host_impl_->CurrentPhysicalTimeTicks();
+}
+
 void LayerTreeImpl::SetNeedsCommit() {
   layer_tree_host_impl_->SetNeedsCommit();
 }
 
 void LayerTreeImpl::SetNeedsRedraw() {
   layer_tree_host_impl_->SetNeedsRedraw();
 }
 
 const LayerTreeDebugState& LayerTreeImpl::debug_state() const {
   return layer_tree_host_impl_->debug_state();
@@ skipping 82 matching lines @@
 
 void LayerTreeImpl::ClearLatencyInfo() {
   latency_info_.Clear();
 }
 
 void LayerTreeImpl::WillModifyTilePriorities() {
   layer_tree_host_impl_->SetNeedsManageTiles();
 }
 
 }  // namespace cc