Force use of and cache render surface.

cc/layers/layer_impl.cc

 // Copyright 2012 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/layers/layer_impl.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <algorithm>
@@ skipping 406 matching lines @@
   if (transform_node && transform_node->transform_changed)
     return true;
   if (effect_tree_index() == EffectTree::kInvalidNodeId)
     return false;
   EffectNode* effect_node = GetEffectTree().Node(effect_tree_index());
   if (effect_node && effect_node->effect_changed)
     return true;
   return false;
 }
 
+bool LayerImpl::LayerPropertyChangedOnly() const {
+  return layer_property_changed_;
+}
+
 void LayerImpl::NoteLayerPropertyChanged() {
   layer_property_changed_ = true;
   layer_tree_impl()->set_needs_update_draw_properties();
   SetNeedsPushProperties();
 }
 
 void LayerImpl::ValidateQuadResourcesInternal(DrawQuad* quad) const {
 #if DCHECK_IS_ON()
   const ResourceProvider* resource_provider =
       layer_tree_impl_->resource_provider();
@@ skipping 558 matching lines @@
 
   const bool has_valid_scroll_node =
       !!GetScrollTree().Node(scroll_tree_index());
   DCHECK(has_valid_scroll_node);
 
   return has_valid_transform_node && has_valid_effect_node &&
          has_valid_clip_node && has_valid_scroll_node;
 }
 
 }  // namespace cc