cc: fix damage tracker rect with hidpi filters.

cc/layers/render_surface_impl.cc

Index: cc/layers/render_surface_impl.cc
diff --git a/cc/layers/render_surface_impl.cc b/cc/layers/render_surface_impl.cc
index 264a6de45abdbbfc2c055ee71dcc28d9c93e446d..68c4543dc7071cd201a175787cc5b9bc1e98a7d6 100644
--- a/cc/layers/render_surface_impl.cc
+++ b/cc/layers/render_surface_impl.cc
@@ -171,6 +171,10 @@ const FilterOperations& RenderSurfaceImpl::Filters() const {
   return OwningEffectNode()->filters;
 }
 
+gfx::Transform RenderSurfaceImpl::FiltersTransform() const {
+  return owning_layer_->DrawTransform();
+}
+
 const FilterOperations& RenderSurfaceImpl::BackgroundFilters() const {
   return OwningEffectNode()->background_filters;
 }