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

cc/trees/single_thread_proxy.cc

Index: cc/trees/single_thread_proxy.cc
diff --git a/cc/trees/single_thread_proxy.cc b/cc/trees/single_thread_proxy.cc
index 1ecce4dd023296642034901ec9e15f7d766d7bbf..31766cbedffe1c3c8149c920a71c1844fa569247 100644
--- a/cc/trees/single_thread_proxy.cc
+++ b/cc/trees/single_thread_proxy.cc
@@ -829,4 +829,9 @@ void SingleThreadProxy::SendBeginFramesToChildren(const BeginFrameArgs& args) {
   layer_tree_host_->SendBeginFramesToChildren(args);
 }
 
+base::TimeTicks SingleThreadProxy::GetNextPredictedRequestAnimationFrameTime()
+    const {
+  return scheduler_on_impl_thread_->NextPredictedRequestAnimationFrameTime();
+}
+
 }  // namespace cc