Add a hide_layer_and_subtree() flag to cc::Layer

cc/layers/layer_impl.h

Index: cc/layers/layer_impl.h
diff --git a/cc/layers/layer_impl.h b/cc/layers/layer_impl.h
index 6ec1573b0c93f44426925cdfdec34d4f8433b867..7645d9ff16f3c764756885b2c8fdd018864f9ab9 100644
--- a/cc/layers/layer_impl.h
+++ b/cc/layers/layer_impl.h
@@ -133,6 +133,9 @@ class CC_EXPORT LayerImpl : LayerAnimationValueObserver {
   void SetDrawsContent(bool draws_content);
   bool DrawsContent() const { return draws_content_; }
 
+  void SetHideLayerAndSubtree(bool hide);
+  bool hide_layer_and_subtree() const { return hide_layer_and_subtree_; }
+
   bool force_render_surface() const { return force_render_surface_; }
   void SetForceRenderSurface(bool force) { force_render_surface_ = force; }
 
@@ -518,6 +521,7 @@ class CC_EXPORT LayerImpl : LayerAnimationValueObserver {
   gfx::Transform transform_;
 
   bool draws_content_;
+  bool hide_layer_and_subtree_;
   bool force_render_surface_;
 
   // Set for the layer that other layers are fixed to.