Add latency measurement system

cc/latency_info.h

+// Copyright 2012 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.
+
+#ifndef CC_LATENCY_INFO_H_
+#define CC_LATENCY_INFO_H_
+
+#include "base/time.h"
+
+namespace cc {
+
+struct LatencyInfo {
+    int64 inputNumber;
+    int64 rendererMainFrameNumber;
+    int64 rendererImplFrameNumber;
+    int64 browserMainFrameNumber;
+    int64 browserImplFrameNumber;
+
+    base::TimeTicks swapTimestamp;
+
+    LatencyInfo()
+        : inputNumber(0)
+        , rendererMainFrameNumber(0)
+        , rendererImplFrameNumber(0)
+        , browserMainFrameNumber(0)
+        , browserImplFrameNumber(0)
+    {
+    }
+};
+
+}  // namespace cc
+
+#endif  // CC_LATENCY_INFO_H_