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+// 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 COMPONENTS_STARTUP_METRIC_UTILS_STARTUP_METRIC_UTILS_H_
+#define COMPONENTS_STARTUP_METRIC_UTILS_STARTUP_METRIC_UTILS_H_
+
+#include <string>
+
+#include "base/time/time.h"
+
+// Utility functions to support metric collection for browser startup.
+
+namespace startup_metric_utils {
+
+// Returns true if any UI other than the browser window has been displayed
+// so far.  Useful to test if UI has been displayed before the first browser
+// window was shown, which would invalidate any surrounding timing metrics.
+bool WasNonBrowserUIDisplayed();
+
+// Call this when displaying UI that might potentially delay the appearance
+// of the initial browser window on Chrome startup.
+//
+// Note on usage: This function is idempotent and its overhead is low enough
+// in comparison with UI display that it's OK to call it on every
+// UI invocation regardless of whether the browser window has already
+// been displayed or not.
+void SetNonBrowserUIDisplayed();
+
+// Call this as early as possible in the startup process to record a
+// timestamp.
+void RecordMainEntryPointTime();
+
+#if defined(OS_ANDROID)
+// On Android the entry point time is the time at which the Java code starts.
+// This is recorded on the Java side, and then passed to the C++ side once the
+// C++ library is loaded and running.
+void RecordSavedMainEntryPointTime(const base::Time& entry_point_time);
+#endif // OS_ANDROID
+
+// Called just before the message loop is about to start. Entry point to record
+// startup stats.
+// |is_first_run| - is the current launch part of a first run.
+void OnBrowserStartupComplete(bool is_first_run);
+
+// Called when the initial page load has finished in order to record startup
+// stats.
+void OnInitialPageLoadComplete();
+
+// Scoper that records the time period before it's destructed in a histogram
+// with the given name. The histogram is only recorded for slow chrome startups.
+// Useful for trying to figure out what parts of Chrome cause slow startup.
+class ScopedSlowStartupUMA {
+ public:
+  explicit ScopedSlowStartupUMA(const std::string& histogram_name)
+      : start_time_(base::TimeTicks::Now()),
+        histogram_name_(histogram_name) {}
+
+  ~ScopedSlowStartupUMA();
+
+ private:
+  const base::TimeTicks start_time_;
+  const std::string histogram_name_;
+
+  DISALLOW_COPY_AND_ASSIGN(ScopedSlowStartupUMA);
+};
+
+}  // namespace startup_metric_utils
+
+#endif  // COMPONENTS_STARTUP_METRIC_UTILS_STARTUP_METRIC_UTILS_H_