cc: Reduce surface contents scale adjustments.

cc/trees/draw_property_utils.cc

Index: cc/trees/draw_property_utils.cc
diff --git a/cc/trees/draw_property_utils.cc b/cc/trees/draw_property_utils.cc
index 1bcf17944720d8349de31abc8c676029ebd706e8..27eb425da9995d22ce9b3ac02f1f37b16c99cbdf 100644
--- a/cc/trees/draw_property_utils.cc
+++ b/cc/trees/draw_property_utils.cc
@@ -899,7 +899,8 @@ void UpdatePropertyTrees(LayerTreeHost* layer_tree_host,
 
 void UpdatePropertyTreesAndRenderSurfaces(LayerImpl* root_layer,
                                           PropertyTrees* property_trees,
-                                          bool can_render_to_separate_surface) {
+                                          bool can_render_to_separate_surface,
+                                          bool can_adjust_raster_scales) {
   bool render_surfaces_need_update = false;
   if (property_trees->non_root_surfaces_enabled !=
       can_render_to_separate_surface) {
@@ -907,6 +908,11 @@ void UpdatePropertyTreesAndRenderSurfaces(LayerImpl* root_layer,
     property_trees->transform_tree.set_needs_update(true);
     render_surfaces_need_update = true;
   }
+  if (property_trees->can_adjust_raster_scales != can_adjust_raster_scales) {
+    property_trees->can_adjust_raster_scales = can_adjust_raster_scales;
+    property_trees->transform_tree.set_needs_update(true);
+    render_surfaces_need_update = true;
+  }
   if (property_trees->transform_tree.needs_update()) {
     property_trees->clip_tree.set_needs_update(true);
     property_trees->effect_tree.set_needs_update(true);