Add a simple scheduler for animation frames

mc/scheduler/time_interval.cc

+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "mc/scheduler/time_interval.h"
+
+#include <cstdlib>
+
+namespace mc {
+
+base::TimeTicks TimeInterval::NextAfter(base::TimeTicks when) {
+  int64 offset = std::abs((when - base).ToInternalValue());
+  base::TimeDelta excess =
+      base::TimeDelta::FromInternalValue(offset % duration.ToInternalValue());
+  return when + duration - excess;
+}
+}