cc: Reduce surface contents scale adjustments.

cc/trees/draw_property_utils.cc

 // Copyright 2014 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/draw_property_utils.h"
 
 #include <stddef.h>
 
 #include <vector>
 
@@ skipping 881 matching lines @@
   UpdateScrollTree(&property_trees->scroll_tree, layer_tree_host);
   ComputeTransforms(&property_trees->transform_tree);
   ComputeEffects(&property_trees->effect_tree);
   // Computation of clips uses ToScreen which is updated while computing
   // transforms. So, ComputeTransforms should be before ComputeClips.
   ComputeClips(property_trees);
 }
 
 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) {
     property_trees->non_root_surfaces_enabled = can_render_to_separate_surface;
     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);
   }
   if (render_surfaces_need_update) {
     property_trees->effect_tree.UpdateRenderSurfaces(
         root_layer->layer_tree_impl(),
         property_trees->non_root_surfaces_enabled);
   }
   UpdateRenderTarget(&property_trees->effect_tree,
@@ skipping 163 matching lines @@
 void UpdateElasticOverscroll(PropertyTrees* property_trees,
                              const Layer* overscroll_elasticity_layer,
                              const gfx::Vector2dF& elastic_overscroll) {
   UpdateElasticOverscrollInternal(property_trees, overscroll_elasticity_layer,
                                   elastic_overscroll);
 }
 
 }  // namespace draw_property_utils
 
 }  // namespace cc