cc: Track BeginMainFrame more precisely in CompositorTimingHistory.

cc/trees/thread_proxy.h

Index: cc/trees/thread_proxy.h
diff --git a/cc/trees/thread_proxy.h b/cc/trees/thread_proxy.h
index 0b954bd7bd5128944dbae6bd1355f13bcfc7269b..871d1b2cd5052b3c09ef742c07a98440b1c7e0f1 100644
--- a/cc/trees/thread_proxy.h
+++ b/cc/trees/thread_proxy.h
@@ -288,9 +288,12 @@ class CC_EXPORT ThreadProxy : public Proxy,
       bool* main_frame_will_happen) override;
   void SetNeedsCommitOnImpl() override;
   void SetNeedsRedrawOnImpl(const gfx::Rect& damage_rect) override;
-  void BeginMainFrameAbortedOnImpl(CommitEarlyOutReason reason) override;
+  void BeginMainFrameAbortedOnImpl(
+      CommitEarlyOutReason reason,
+      base::TimeTicks main_thread_start_time) override;
   void StartCommitOnImpl(CompletionEvent* completion,
                          LayerTreeHost* layer_tree_host,
+                         base::TimeTicks main_thread_start_time,
                          bool hold_commit_for_activation) override;
   void InitializeImplOnImpl(CompletionEvent* completion,
                             LayerTreeHost* layer_tree_host) override;