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// Copyright (c) 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 CHROME_COMMON_STARTUP_METRIC_UTILS_H_
#define CHROME_COMMON_STARTUP_METRIC_UTILS_H_
#include <string>
#include "base/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();
// Called just before the message loop is about to start. Entry point to record
// startup stats.
void OnBrowserStartupComplete();
// 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 // CHROME_COMMON_STARTUP_METRIC_UTILS_H_
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