CC Animations: Port Impl-only-scrolling to use compositor animation timelines.

cc/trees/layer_tree_host.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.h"
 
 #include <algorithm>
 #include <stack>
 #include <string>
 
@@ skipping 1355 matching lines @@
 
 void LayerTreeHost::SetLayerScrollOffsetMutated(
     int layer_id,
     bool active_tree,
     const gfx::ScrollOffset& scroll_offset) {
   LayerAnimationValueObserver* layer = LayerById(layer_id);
   DCHECK(layer);
   layer->OnScrollOffsetAnimated(scroll_offset);
 }
 
+gfx::ScrollOffset LayerTreeHost::GetScrollOffsetForAnimation(
+    int layer_id) const {
+  LayerAnimationValueProvider* layer = LayerById(layer_id);
+  DCHECK(layer);
+  return layer->ScrollOffsetForAnimation();
+}
+
 bool LayerTreeHost::IsAnimatingFilterProperty(const Layer* layer) const {
   return animation_host_
              ? animation_host_->IsAnimatingFilterProperty(layer->id())
              : false;
 }
 
 bool LayerTreeHost::IsAnimatingOpacityProperty(const Layer* layer) const {
   return animation_host_
              ? animation_host_->IsAnimatingOpacityProperty(layer->id())
              : false;
@@ skipping 15 matching lines @@
   return animation_host_ ? animation_host_->HasAnyAnimation(layer->id())
                          : false;
 }
 
 bool LayerTreeHost::HasActiveAnimation(const Layer* layer) const {
   return animation_host_ ? animation_host_->HasActiveAnimation(layer->id())
                          : false;
 }
 
 }  // namespace cc