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

cc/trees/layer_tree_host_impl.cc

Index: cc/trees/layer_tree_host_impl.cc
diff --git a/cc/trees/layer_tree_host_impl.cc b/cc/trees/layer_tree_host_impl.cc
index 9259b34743b8906fbee1a0ac5a63a78b38d5e5c0..5445aed8fea72bdc7d18f26c711f586b76f57ec6 100644
--- a/cc/trees/layer_tree_host_impl.cc
+++ b/cc/trees/layer_tree_host_impl.cc
@@ -283,6 +283,7 @@ void LayerTreeHostImpl::BeginMainFrameAborted(CommitEarlyOutReason reason) {
   if (CommitEarlyOutHandledCommit(reason)) {
     active_tree_->ApplySentScrollAndScaleDeltasFromAbortedCommit();
     active_tree_->ResetContentsTexturesPurged();
+    RecordMainFrameTiming();
   }
 }
 
@@ -1836,6 +1837,7 @@ void LayerTreeHostImpl::ActivateSyncTree() {
         pending_page_scale_animation->scale,
         pending_page_scale_animation->duration);
   }
+  RecordMainFrameTiming();
 }
 
 void LayerTreeHostImpl::SetVisible(bool visible) {
@@ -2077,6 +2079,22 @@ void LayerTreeHostImpl::CreateResourceAndTileTaskWorkerPool(
                                      settings_.renderer_settings.refresh_rate));
 }
 
+void LayerTreeHostImpl::SetBeginMainFrameTime(base::TimeTicks frame_time) {
+  main_frame_time_ = frame_time;
+}
+
+void LayerTreeHostImpl::RecordMainFrameTiming() {
+  std::vector<int64_t> request_ids;
+  active_tree_->GatherFrameTimingRequestIds(&request_ids);
+  if (request_ids.empty())
+    return;
+
+  base::TimeTicks end_time = client_->GetNextBeginImplFrameTimeIfRequested();
+  frame_timing_tracker_->SaveMainFrameTimeStamps(
+      request_ids, main_frame_time_, end_time,
+      active_tree_->source_frame_number());
+}
+
 void LayerTreeHostImpl::DestroyTileManager() {
   tile_manager_ = nullptr;
   resource_pool_ = nullptr;