cc: Correct elastic overscroll synchronization.

cc/trees/layer_tree.cc

 // Copyright 2016 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.h"
 
 #include "base/auto_reset.h"
 #include "base/time/time.h"
 #include "cc/animation/animation_host.h"
 #include "cc/input/page_scale_animation.h"
@@ skipping 451 matching lines @@
       event_listener_properties(EventListenerClass::kMouseWheel)));
   proto->set_touch_start_or_move_event_listener_properties(
       static_cast<uint32_t>(
           event_listener_properties(EventListenerClass::kTouchStartOrMove)));
   proto->set_touch_end_or_cancel_event_listener_properties(
       static_cast<uint32_t>(
           event_listener_properties(EventListenerClass::kTouchEndOrCancel)));
 
   LayerSelectionToProtobuf(inputs_.selection, proto->mutable_selection());
   property_trees_.ToProtobuf(proto->mutable_property_trees());
+  Vector2dFToProto(elastic_overscroll_, proto->mutable_elastic_overscroll());
 }
 
 void LayerTree::FromProtobuf(const proto::LayerTree& proto) {
   // Layer hierarchy.
   scoped_refptr<Layer> new_root_layer =
       LayerProtoConverter::DeserializeLayerHierarchy(
           inputs_.root_layer, proto.root_layer(), layer_tree_host_);
   if (inputs_.root_layer != new_root_layer) {
     inputs_.root_layer = new_root_layer;
   }
@@ skipping 41 matching lines @@
           proto.touch_start_or_move_event_listener_properties());
   inputs_.event_listener_properties[static_cast<size_t>(
       EventListenerClass::kTouchEndOrCancel)] =
       static_cast<EventListenerProperties>(
           proto.touch_end_or_cancel_event_listener_properties());
 
   hud_layer_ = static_cast<HeadsUpDisplayLayer*>(
       UpdateAndGetLayer(hud_layer_.get(), proto.hud_layer_id(), this));
 
   LayerSelectionFromProtobuf(&inputs_.selection, proto.selection());
+  elastic_overscroll_ = ProtoToVector2dF(proto.elastic_overscroll());
 
   // It is required to create new PropertyTrees before deserializing it.
   property_trees_ = PropertyTrees();
   property_trees_.FromProtobuf(proto.property_trees());
 
   // Forcefully override the sequence number of all layers in the tree to have
   // a valid sequence number. Changing the sequence number for a layer does not
   // need a commit, so the value will become out of date for layers that are not
   // updated for other reasons. All layers that at this point are part of the
   // layer tree are valid, so it is OK that they have a valid sequence number.
@@ skipping 169 matching lines @@
 LayerListReverseIterator<Layer> LayerTree::rend() {
   return LayerListReverseIterator<Layer>(nullptr);
 }
 
 void LayerTree::SetNeedsDisplayOnAllLayers() {
   for (auto* layer : *this)
     layer->SetNeedsDisplay();
 }
 
 }  // namespace cc