Change LayerHostImpl to use frame time from BeginFrameArgs rather than ::Now()

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/base/math_util.h"
@@ skipping 237 matching lines @@
   DCHECK(IsActiveTree());
   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(CurrentPhysicalTimeTicks());
+    currently_scrolling_layer_->scrollbar_animation_controller()
+        ->DidScrollGestureEnd(CurrentFrameTimeTicks());

[aelias_OOO_until_Jul13, 2014/03/21 01:37:44]

physical time.  Note that I specifically changed this line from frame time to
physical time to fix a regression in this patch:
https://chromiumcodereview.appspot.com/16925007

   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 405 matching lines @@
 }
 
 bool LayerTreeImpl::PinchGestureActive() const {
   return layer_tree_host_impl_->pinch_gesture_active();
 }
 
 base::TimeTicks LayerTreeImpl::CurrentFrameTimeTicks() const {
   return layer_tree_host_impl_->CurrentFrameTimeTicks();
 }
 
-base::TimeTicks LayerTreeImpl::CurrentPhysicalTimeTicks() const {
-  return layer_tree_host_impl_->CurrentPhysicalTimeTicks();
-}
-
 void LayerTreeImpl::SetNeedsCommit() {
   layer_tree_host_impl_->SetNeedsCommit();
 }
 
 gfx::Size LayerTreeImpl::DrawViewportSize() const {
   return layer_tree_host_impl_->DrawViewportSize();
 }
 
 void LayerTreeImpl::StartScrollbarAnimation() {
   layer_tree_host_impl_->StartScrollbarAnimation();
@@ skipping 255 matching lines @@
 const std::vector<LayerImpl*>& LayerTreeImpl::LayersWithCopyOutputRequest()
     const {
   // Only the active tree needs to know about layers with copy requests, as
   // they are aborted if not serviced during draw.
   DCHECK(IsActiveTree());
 
   return layers_with_copy_output_request_;
 }
 
 }  // namespace cc