cc : Stop pushing layers from hidden subtrees at commit

cc/layers/layer.h

Index: cc/layers/layer.h
diff --git a/cc/layers/layer.h b/cc/layers/layer.h
index c88721b0fa6e1e82ad3728900e1d3f93b7cc566b..06fee4bcfa21bd8c1a5903c48042b450e356d3ae 100644
--- a/cc/layers/layer.h
+++ b/cc/layers/layer.h
@@ -25,6 +25,7 @@
 #include "cc/layers/layer_collections.h"
 #include "cc/layers/layer_position_constraint.h"
 #include "cc/paint/paint_record.h"
+#include "cc/surfaces/surface_id.h"
 #include "cc/trees/element_id.h"
 #include "cc/trees/mutator_host_client.h"
 #include "cc/trees/property_tree.h"
@@ -313,6 +314,10 @@ class CC_EXPORT Layer : public base::RefCounted<Layer> {
 
   virtual bool IsSnapped();
 
+  virtual bool IsSurfaceLayer() const;
+
+  virtual const SurfaceId* GetSurfaceId() const;
+
   virtual void PushPropertiesTo(LayerImpl* layer);
 
   LayerTreeHost* GetLayerTreeHostForTesting() const { return layer_tree_host_; }
@@ -377,6 +382,10 @@ class CC_EXPORT Layer : public base::RefCounted<Layer> {
     return should_flatten_transform_from_property_tree_;
   }
 
+  void SetIsHidden(bool is_hidden);
+
+  bool is_hidden() const { return is_hidden_; }
+
   const gfx::Rect& visible_layer_rect_for_testing() const {
     return visible_layer_rect_;
   }
@@ -613,6 +622,7 @@ class CC_EXPORT Layer : public base::RefCounted<Layer> {
   gfx::Vector2dF offset_to_transform_parent_;
   bool should_flatten_transform_from_property_tree_ : 1;
   bool draws_content_ : 1;
+  bool is_hidden_ : 1;
   bool use_local_transform_for_backface_visibility_ : 1;
   bool should_check_backface_visibility_ : 1;
   bool force_render_surface_for_testing_ : 1;