Send takeover msg from MT to CC using the animation path.

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 396 matching lines @@
 bool LayerImpl::user_scrollable(ScrollbarOrientation orientation) const {
   return (orientation == HORIZONTAL) ? user_scrollable_horizontal_
                                      : user_scrollable_vertical_;
 }
 
 std::unique_ptr<LayerImpl> LayerImpl::CreateLayerImpl(
     LayerTreeImpl* tree_impl) {
   return LayerImpl::Create(tree_impl, layer_id_);
 }
 
-void LayerImpl::set_main_thread_scrolling_reasons(
-    uint32_t main_thread_scrolling_reasons) {
-  if (main_thread_scrolling_reasons_ == main_thread_scrolling_reasons)
-    return;
-
-  if (main_thread_scrolling_reasons &
-          MainThreadScrollingReason::kHasNonLayerViewportConstrainedObjects &&
-      layer_tree_impl()) {
-    if (layer_tree_impl()->ScrollOffsetIsAnimatingOnImplOnly(this)) {
-      const bool needs_completion = true;
-      layer_tree_impl()->ScrollAnimationAbort(needs_completion);
-    }
-  }
-
-  main_thread_scrolling_reasons_ = main_thread_scrolling_reasons;
-}
-
 void LayerImpl::PushPropertiesTo(LayerImpl* layer) {
   layer->SetBackgroundColor(background_color_);
   layer->SetSafeOpaqueBackgroundColor(safe_opaque_background_color_);
   layer->SetBounds(bounds_);
   layer->SetDrawsContent(DrawsContent());
   // If whether layer has render surface changes, we need to update draw
   // properties.
   // TODO(weiliangc): Should be safely removed after impl side is able to
   // update render surfaces without rebuilding property trees.
   if (layer->has_render_surface() != has_render_surface())
@@ skipping 970 matching lines @@
            .layer_transforms_should_scale_layer_contents) {
     return default_scale;
   }
 
   gfx::Vector2dF transform_scales = MathUtil::ComputeTransform2dScaleComponents(
       DrawTransform(), default_scale);
   return std::max(transform_scales.x(), transform_scales.y());
 }
 
 }  // namespace cc