cc : Stop pushing layers from hidden subtrees at commit

cc/layers/layer.cc

Index: cc/layers/layer.cc
diff --git a/cc/layers/layer.cc b/cc/layers/layer.cc
index 4740816bbb011a2908c9156a93f347d7680fafa3..3cf721462e5290e6b6ebbbfee918b2bf322125da 100644
--- a/cc/layers/layer.cc
+++ b/cc/layers/layer.cc
@@ -88,6 +88,7 @@ Layer::Layer()
       property_tree_sequence_number_(-1),
       should_flatten_transform_from_property_tree_(false),
       draws_content_(false),
+      is_hidden_(false),
       should_check_backface_visibility_(false),
       force_render_surface_for_testing_(false),
       subtree_property_changed_(false),
@@ -1296,6 +1297,16 @@ void Layer::didUpdateMainThreadScrollingReasons() {
     inputs_.client->didUpdateMainThreadScrollingReasons();
 }
 
+void Layer::SetIsHidden(bool is_hidden) {
+  DCHECK(layer_tree_host_);
+  if (is_hidden == is_hidden_)
+    return;
+  is_hidden_ = is_hidden;
+  // We don't push layers that are hidden to compositor thread at commit. So,
+  // we need a full tree sync when is_hidden changes.
+  layer_tree_host_->SetNeedsFullTreeSync();
+}
+
 void Layer::SetSubtreePropertyChanged() {
   if (subtree_property_changed_)
     return;