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 23e90e11134d4e6fc405418ddd0e1a7b463c2306..08c691200a0a886bc7ba6c1abfad9227b62ac358 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;