Overscroll and Elasticity for views::ScrollView

cc/trees/layer_tree_host_common.cc

Index: cc/trees/layer_tree_host_common.cc
diff --git a/cc/trees/layer_tree_host_common.cc b/cc/trees/layer_tree_host_common.cc
index ecd848bc5af859d82cb2151a4aa3f0667a8d648c..c42b8bed0b06f542b200a3afc72cbe0a37426870 100644
--- a/cc/trees/layer_tree_host_common.cc
+++ b/cc/trees/layer_tree_host_common.cc
@@ -169,19 +169,22 @@ LayerTreeHostCommon::ScrollUpdateInfo::ScrollUpdateInfo()
 
 bool LayerTreeHostCommon::ScrollUpdateInfo::operator==(
     const LayerTreeHostCommon::ScrollUpdateInfo& other) const {
-  return layer_id == other.layer_id && scroll_delta == other.scroll_delta;
+  return layer_id == other.layer_id && scroll_delta == other.scroll_delta &&
+         overscroll == other.overscroll;
 }
 
 void LayerTreeHostCommon::ScrollUpdateInfo::ToProtobuf(
     proto::ScrollUpdateInfo* proto) const {
   proto->set_layer_id(layer_id);
   Vector2dToProto(scroll_delta, proto->mutable_scroll_delta());
+  ScrollOffsetToProto(overscroll, proto->mutable_overscroll());
 }
 
 void LayerTreeHostCommon::ScrollUpdateInfo::FromProtobuf(
     const proto::ScrollUpdateInfo& proto) {
   layer_id = proto.layer_id();
   scroll_delta = ProtoToVector2d(proto.scroll_delta());
+  overscroll = ProtoToScrollOffset(proto.overscroll());
 }
 
 ScrollAndScaleSet::ScrollAndScaleSet()