[Android] Support startup histogram.

chrome/common/android/startup_metric_utils_android.h

+// Copyright 2013 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 CHROME_COMMON_ANDROID_STARTUP_METRIC_UTILS_ANDROID_H_
+#define CHROME_COMMON_ANDROID_STARTUP_METRIC_UTILS_ANDROID_H_
+
+#include <jni.h>
+
+#include "base/time/time.h"
+
+namespace chrome {
+namespace android {
+
+base::Time GetMainEntryPointTime();
+bool RegisterStartupMetricUtils(JNIEnv* env);
+
+}  // namespace android
+}  // namespace chrome
+
+#endif  // CHROME_COMMON_ANDROID_STARTUP_METRIC_UTILS_ANDROID_H_