cc : Stop pushing layers from hidden subtrees at commit

cc/trees/layer_tree_host.cc

Index: cc/trees/layer_tree_host.cc
diff --git a/cc/trees/layer_tree_host.cc b/cc/trees/layer_tree_host.cc
index 8db96130c74303927c5712016310f894d3d87349..9a74bacb0f05aa9857c8f6d960f3659bdafee193 100644
--- a/cc/trees/layer_tree_host.cc
+++ b/cc/trees/layer_tree_host.cc
@@ -1092,6 +1092,25 @@ bool LayerTreeHost::PaintContent(const LayerList& update_layer_list,
   return did_paint_content;
 }
 
+void LayerTreeHost::AddSurfaceLayerId(const SurfaceId& surface_id) {
+  surface_layer_ids_.push_back(surface_id);

[jaydasika, 2017/05/23 00:25:14]

Will add a DCHECK for checking surface id is not already in the list.

+}
+
+void LayerTreeHost::RemoveSurfaceLayerId(const SurfaceId& surface_id) {
+  auto pos = std::find(surface_layer_ids_.begin(), surface_layer_ids_.end(),
+                       surface_id);
+  if (pos != surface_layer_ids_.end())
+    surface_layer_ids_.erase(pos);
+}
+
+const std::vector<SurfaceId>& LayerTreeHost::SurfaceLayerIds() const {
+  return surface_layer_ids_;
+}
+
+void LayerTreeHost::ClearSurfaceLayerIds() {
+  surface_layer_ids_.clear();
+}
+
 void LayerTreeHost::AddLayerShouldPushProperties(Layer* layer) {
   layers_that_should_push_properties_.insert(layer);
 }