cc: Move OnScrollOffsetAnimated to scroll tree

cc/layers/layer_impl.cc

 // Copyright 2012 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/layers/layer_impl.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <algorithm>
@@ skipping 524 matching lines @@
   if (HasAnyAnimationTargetingProperty(TargetProperty::TRANSFORM)) {
     UpdatePropertyTreeTransformIsAnimated(
         HasPotentiallyRunningTransformAnimation());
   }
 }
 
 gfx::ScrollOffset LayerImpl::ScrollOffsetForAnimation() const {
   return CurrentScrollOffset();
 }
 
-void LayerImpl::OnScrollOffsetAnimated(const gfx::ScrollOffset& scroll_offset) {
-  // Only layers in the active tree should need to do anything here, since
-  // layers in the pending tree will find out about these changes as a
-  // result of the shared SyncedProperty.
-  if (!IsActive())
-    return;
-
-  SetCurrentScrollOffset(ClampScrollOffsetToLimits(scroll_offset));
-
-  layer_tree_impl_->DidAnimateScrollOffset();
-}
-
 void LayerImpl::OnTransformIsCurrentlyAnimatingChanged(
     bool is_currently_animating) {
   DCHECK(layer_tree_impl_);
   PropertyTrees* property_trees = layer_tree_impl()->property_trees();
   if (!property_trees->IsInIdToIndexMap(PropertyTrees::TreeType::TRANSFORM,
                                         id()))
     return;
   TransformNode* node = property_trees->transform_tree.Node(
       property_trees->transform_id_to_index_map[id()]);
   node->is_currently_animating = is_currently_animating;
@@ skipping 552 matching lines @@
            .layer_transforms_should_scale_layer_contents) {
     return default_scale;
   }
 
   gfx::Vector2dF transform_scales = MathUtil::ComputeTransform2dScaleComponents(
       ScreenSpaceTransform(), default_scale);
   return std::max(transform_scales.x(), transform_scales.y());
 }
 
 }  // namespace cc