cc: Implement unified BeginFrame on aura

cc/test/begin_frame_args_test.cc

Index: cc/test/begin_frame_args_test.cc
diff --git a/cc/test/begin_frame_args_test.cc b/cc/test/begin_frame_args_test.cc
index 7b2974867469d3803d029dedc483dff233290edb..cabad52bbec864eb8f990496210f4195eebb4413 100644
--- a/cc/test/begin_frame_args_test.cc
+++ b/cc/test/begin_frame_args_test.cc
@@ -73,11 +73,6 @@ BeginFrameArgs CreateExpiredBeginFrameArgsForTesting(
       BeginFrameArgs::DefaultInterval(), BeginFrameArgs::NORMAL);
 }
 
-bool operator==(const BeginFrameArgs& lhs, const BeginFrameArgs& rhs) {
-  return (lhs.type == rhs.type) && (lhs.frame_time == rhs.frame_time) &&
-         (lhs.deadline == rhs.deadline) && (lhs.interval == rhs.interval);
-}
-
 ::std::ostream& operator<<(::std::ostream& os, const BeginFrameArgs& args) {
   PrintTo(args, &os);
   return os;