metrics: Add dbus interface for GetRandomPerfOutput

chrome/browser/metrics/windowed_incognito_observer.h

+// Copyright 2015 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_BROWSER_METRICS_WINDOWED_INCOGNITO_OBSERVER_H_
+#define CHROME_BROWSER_METRICS_WINDOWED_INCOGNITO_OBSERVER_H_
+
+#include "base/macros.h"
+#include "chrome/browser/ui/browser_list_observer.h"
+
+class Browser;
+
+namespace metrics {
+
+// This class watches for any incognito window being opened from the time it is
+// instantiated to the time it is destroyed.
+class WindowedIncognitoObserver : public chrome::BrowserListObserver {
+ public:
+  WindowedIncognitoObserver();
+  ~WindowedIncognitoObserver() override;
+
+  // This method can be checked to see whether any incognito window has been
+  // opened since the time this object was created.
+  bool incognito_launched() const {
+    return incognito_launched_;
+  }
+
+ protected:
+  // For testing.
+  void set_incognito_launched(bool value) {
+    incognito_launched_ = value;
+  }
+
+ private:
+  // chrome::BrowserListObserver implementation.
+  void OnBrowserAdded(Browser* browser) override;
+
+  // Gets set if an incognito window was opened during the lifetime of the
+  // object. Closing the window does not clear the flag.
+  bool incognito_launched_;
+
+  DISALLOW_COPY_AND_ASSIGN(WindowedIncognitoObserver);
+};
+
+}  // namespace metrics
+
+#endif  // CHROME_BROWSER_METRICS_WINDOWED_INCOGNITO_OBSERVER_H_