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

cc/trees/thread_proxy.cc

Index: cc/trees/thread_proxy.cc
diff --git a/cc/trees/thread_proxy.cc b/cc/trees/thread_proxy.cc
index db69b8203def40e71e3bf89575907a0be09da1ee..2260d12c59d39fc96a327f17fcf4b487cb331aa3 100644
--- a/cc/trees/thread_proxy.cc
+++ b/cc/trees/thread_proxy.cc
@@ -685,6 +685,8 @@ void ThreadProxy::ScheduledActionSendBeginMainFrame() {
       impl().layer_tree_host_impl->memory_allocation_priority_cutoff();
   begin_main_frame_state->evicted_ui_resources =
       impl().layer_tree_host_impl->EvictedUIResourcesExist();
+  impl().layer_tree_host_impl->SetBeginMainFrameTime(
+      impl().scheduler->LastBeginImplFrameTime());
   Proxy::MainThreadTaskRunner()->PostTask(
       FROM_HERE,
       base::Bind(&ThreadProxy::BeginMainFrame,
@@ -917,8 +919,10 @@ void ThreadProxy::BeginMainFrameAbortedOnImplThread(
   DCHECK(impl().scheduler->CommitPending());
   DCHECK(!impl().layer_tree_host_impl->pending_tree());
 
-  if (CommitEarlyOutHandledCommit(reason))
+  if (CommitEarlyOutHandledCommit(reason)) {
     SetInputThrottledUntilCommitOnImplThread(false);
+    impl().layer_tree_host_impl->RecordMainFrameTiming();
+  }
   impl().layer_tree_host_impl->BeginMainFrameAborted(reason);
   impl().scheduler->BeginMainFrameAborted(reason);
 }
@@ -1374,4 +1378,9 @@ void ThreadProxy::DidCompletePageScaleAnimationOnImplThread() {
                             main_thread_weak_ptr_));
 }
 
+base::TimeTicks ThreadProxy::GetNextBeginImplFrameTimeIfRequested() const {
+  DCHECK(IsImplThread());
+  return impl().scheduler->NextBeginImplFrameTimeIfRequested();
+}
+
 }  // namespace cc