Only Record Ugliness Histogram for Compositor Side Changes

cc/trees/layer_tree_impl.h

Index: cc/trees/layer_tree_impl.h
diff --git a/cc/trees/layer_tree_impl.h b/cc/trees/layer_tree_impl.h
index 48c6f4732d6cbd83bb327a1107a31baf7146aa6d..1068069c57a553097320afbca898cd36956d0e55 100644
--- a/cc/trees/layer_tree_impl.h
+++ b/cc/trees/layer_tree_impl.h
@@ -188,6 +188,11 @@ class CC_EXPORT LayerTreeImpl {
 
   void ForceRedrawNextActivation() { next_activation_forces_redraw_ = true; }
 
+  void set_has_ever_been_drawn(bool has_drawn) {
+    has_ever_been_drawn_ = has_drawn;
+  }
+  bool has_ever_been_drawn() const { return has_ever_been_drawn_; }
+
   void set_ui_resource_request_queue(const UIResourceRequestQueue& queue);
 
   const LayerImplList& RenderSurfaceLayerList() const;
@@ -330,6 +335,8 @@ class CC_EXPORT LayerTreeImpl {
 
   bool next_activation_forces_redraw_;
 
+  bool has_ever_been_drawn_;
+
   ScopedPtrVector<SwapPromise> swap_promise_list_;
 
   UIResourceRequestQueue ui_resource_request_queue_;