cc: Add main frame timing info to frame timing tracker.

cc/trees/layer_tree_host_impl_unittest.cc

Index: cc/trees/layer_tree_host_impl_unittest.cc
diff --git a/cc/trees/layer_tree_host_impl_unittest.cc b/cc/trees/layer_tree_host_impl_unittest.cc
index 4b2bc7549ed22b259982df653c5b8b67713fa471..0ba73f4c5a5237a55a87644620ed665e7ac8cd7a 100644
--- a/cc/trees/layer_tree_host_impl_unittest.cc
+++ b/cc/trees/layer_tree_host_impl_unittest.cc
@@ -160,6 +160,9 @@ class LayerTreeHostImplTest : public testing::Test,
   void DidCompletePageScaleAnimationOnImplThread() override {
     did_complete_page_scale_animation_ = true;
   }
+  base::TimeTicks GetNextBeginImplFrameTimeIfRequested() const override {
+    return base::TimeTicks();
+  }
 
   void set_reduce_memory_result(bool reduce_memory_result) {
     reduce_memory_result_ = reduce_memory_result;