Compute if a layer is drawn without LayerTree hierarchy

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 48e9529f3d37a21087bf325dd567c92cd0efbc48..753a24df8df361c041d9d6ab7a7cb5c7c891b68f 100644
--- a/cc/layers/layer_impl.h
+++ b/cc/layers/layer_impl.h
@@ -320,7 +320,7 @@ class CC_EXPORT LayerImpl : public LayerAnimationValueObserver,
   bool contents_opaque() const { return contents_opaque_; }
 
   void SetOpacity(float opacity);
-  float opacity() const { return opacity_; }
+  float opacity() const { return hide_layer_and_subtree_ ? 0.f : opacity_; }
   bool OpacityIsAnimating() const;
   bool HasPotentiallyRunningOpacityAnimation() const;
   bool OpacityIsAnimatingOnImplOnly() const;
@@ -685,13 +685,7 @@ class CC_EXPORT LayerImpl : public LayerAnimationValueObserver,
 
   void UpdatePropertyTreeForScrollingAndAnimationIfNeeded();
 
-  void set_is_hidden_from_property_trees(bool is_hidden) {
-    if (is_hidden == is_hidden_from_property_trees_)
-      return;
-    is_hidden_from_property_trees_ = is_hidden;
-    SetNeedsPushProperties();
-  }
-  bool LayerIsHidden() const;
+  bool IsHidden() const;
 
   float GetIdealContentsScale() const;
 
@@ -895,7 +889,6 @@ class CC_EXPORT LayerImpl : public LayerAnimationValueObserver,
   // If true, the layer or one of its descendants has a wheel or touch handler.
   bool layer_or_descendant_has_input_handler_;
   bool sorted_for_recursion_;
-  bool is_hidden_from_property_trees_;
 
   DISALLOW_COPY_AND_ASSIGN(LayerImpl);
 };