Force use of and cache render surface.

cc/layers/layer_impl.h

 // Copyright 2011 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.
 
 #ifndef CC_LAYERS_LAYER_IMPL_H_
 #define CC_LAYERS_LAYER_IMPL_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 325 matching lines @@
 
   // Note this rect is in layer space (not content space).
   void SetUpdateRect(const gfx::Rect& update_rect);
   const gfx::Rect& update_rect() const { return update_rect_; }
 
   void AddDamageRect(const gfx::Rect& damage_rect);
   const gfx::Rect& damage_rect() const { return damage_rect_; }
 
   virtual std::unique_ptr<base::DictionaryValue> LayerTreeAsJson();
 
+  // This includes |layer_property_changed_| and property_trees changes.
   bool LayerPropertyChanged() const;
+  // Only checks |layer_property_changed_|. Used in damage_tracker to determine
+  // if there is a contributing content damage not from property_trees changes
+  // in animaiton.
+  bool LayerPropertyChangedNotFromPropertyTrees() const;
 
   void ResetChangeTracking();
 
   virtual SimpleEnclosedRegion VisibleOpaqueRegion() const;
 
   virtual void DidBecomeActive() {}
 
   virtual void DidBeginTracing();
 
   // Release resources held by this layer. Called when the output surface
@@ skipping 207 matching lines @@
   bool raster_even_if_not_drawn_ : 1;
 
   bool has_transform_node_ : 1;
 
   DISALLOW_COPY_AND_ASSIGN(LayerImpl);
 };
 
 }  // namespace cc
 
 #endif  // CC_LAYERS_LAYER_IMPL_H_