[not for review] Add Draw entries to window Performance Timeline

cc/trees/layer_tree_host_common.cc

Index: cc/trees/layer_tree_host_common.cc
diff --git a/cc/trees/layer_tree_host_common.cc b/cc/trees/layer_tree_host_common.cc
index 3bbbf6340b623d5e0dd95258d4cf3e00ec0308d6..310f432f44b01b41168b573e20eec1ba3858b49d 100644
--- a/cc/trees/layer_tree_host_common.cc
+++ b/cc/trees/layer_tree_host_common.cc
@@ -25,6 +25,14 @@ ScrollAndScaleSet::ScrollAndScaleSet() {}
 
 ScrollAndScaleSet::~ScrollAndScaleSet() {}
 
+LayerTreeHostCommon::DrawTimingInfo::DrawTimingInfo() {}
+
+LayerTreeHostCommon::DrawTimingInfo::~DrawTimingInfo() {}
+
+DrawTimingSet::DrawTimingSet() {}
+
+DrawTimingSet::~DrawTimingSet() {}
+
 static void SortLayers(LayerList::iterator forst,
                        LayerList::iterator end,
                        void* layer_sorter) {