Fix scrollbar fade animation scheduling.

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 <algorithm>
 
 #include "base/basictypes.h"
 #include "base/json/json_writer.h"
@@ skipping 1909 matching lines @@
   active_tree_->ClearCurrentlyScrollingLayer();
   did_lock_scrolling_layer_ = false;
   accumulated_root_overscroll_ = gfx::Vector2dF();
   current_fling_velocity_ = gfx::Vector2dF();
 }
 
 void LayerTreeHostImpl::ScrollEnd() {
   if (top_controls_manager_)
     top_controls_manager_->ScrollEnd();
   ClearCurrentlyScrollingLayer();
-  StartScrollbarAnimation(CurrentFrameTimeTicks());
+  StartScrollbarAnimation();
 }
 
 InputHandler::ScrollStatus LayerTreeHostImpl::FlingScrollBegin() {
   if (active_tree_->CurrentlyScrollingLayer())
     return ScrollStarted;
 
   return ScrollIgnored;
 }
 
 void LayerTreeHostImpl::NotifyCurrentFlingVelocity(gfx::Vector2dF velocity) {
@@ skipping 251 matching lines @@
     TRACE_EVENT_INSTANT0(
         "cc", "LayerTreeHostImpl::SetNeedsRedraw due to AnimateScrollbars",
         TRACE_EVENT_SCOPE_THREAD);
     client_->SetNeedsRedrawOnImplThread();
   }
 
   for (size_t i = 0; i < layer->children().size(); ++i)
     AnimateScrollbarsRecursive(layer->children()[i], time);
 }
 
-void LayerTreeHostImpl::StartScrollbarAnimation(base::TimeTicks time) {
+void LayerTreeHostImpl::StartScrollbarAnimation() {
   TRACE_EVENT0("cc", "LayerTreeHostImpl::StartScrollbarAnimation");
-  StartScrollbarAnimationRecursive(RootLayer(), time);
+  StartScrollbarAnimationRecursive(RootLayer(), base::TimeTicks::Now());
 }
 
 void LayerTreeHostImpl::StartScrollbarAnimationRecursive(LayerImpl* layer,
                                                          base::TimeTicks time) {
   if (!layer)
     return;
 
   ScrollbarAnimationController* scrollbar_controller =
       layer->scrollbar_animation_controller();
   if (scrollbar_controller && scrollbar_controller->IsAnimating()) {
@@ skipping 93 matching lines @@
 }
 
 void LayerTreeHostImpl::SetDebugState(const LayerTreeDebugState& debug_state) {
   if (debug_state_.continuous_painting != debug_state.continuous_painting)
     paint_time_counter_->ClearHistory();
 
   debug_state_ = debug_state;
 }
 
 }  // namespace cc