[App banners] Add UMA metrics

chrome/browser/banners/app_banner_metrics.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_BANNERS_APP_BANNER_METRICS_H_
+#define CHROME_BROWSER_BANNERS_APP_BANNER_METRICS_H_
+
+namespace banners {
+
+// Keep in sync with the values defined in histograms.xml.
+enum DisplayEvent {
+  DISPLAY_EVENT_MIN = 0,
+  DISPLAY_EVENT_BANNER_REQUESTED = 1,
+  DISPLAY_EVENT_BLOCKED_PREVIOUSLY = 2,
+  DISPLAY_EVENT_PROMOTED_TOO_MANY_OTHERS = 3,
+  DISPLAY_EVENT_CREATED = 4,
+  DISPLAY_EVENT_INSTALLED_PREVIOUSLY = 5,
+  DISPLAY_EVENT_IGNORED_PREVIOUSLY = 6,
+  DISPLAY_EVENT_LACKS_SERVICE_WORKER = 7,
+  DISPLAY_EVENT_NOT_VISITED_ENOUGH = 8,
+  DISPLAY_EVENT_MAX = 9,
+};
+
+enum InstallEvent {
+  INSTALL_EVENT_MIN = 20,
+  INSTALL_EVENT_NATIVE_APP_INSTALL_TRIGGERED = 21,
+  INSTALL_EVENT_NATIVE_APP_INSTALL_STARTED = 22,
+  INSTALL_EVENT_NATIVE_APP_INSTALL_COMPLETED = 23,
+  INSTALL_EVENT_WEB_APP_INSTALLED = 24,
+  INSTALL_EVENT_MAX = 25,
+};
+
+enum DismissEvent {
+  DISMISS_EVENT_MIN = 40,
+  DISMISS_EVENT_ERROR = 41,
+  DISMISS_EVENT_APP_OPEN = 42,
+  DISMISS_EVENT_BANNER_CLICK = 43,
+  DISMISS_EVENT_BANNER_SWIPE = 44,
+  DISMISS_EVENT_CLOSE_BUTTON = 45,
+  DISMISS_EVENT_INSTALL_TIMEOUT = 46,
+  DISMISS_EVENT_DISMISSED = 47,
+  DISMISS_EVENT_MAX = 48,
+};
+
+void TrackDismissEvent(int event);
+void TrackDisplayEvent(int event);
+void TrackInstallEvent(int event);
+
+};  // namespace banners
+
+#endif  // CHROME_BROWSER_BANNERS_APP_BANNER_METRICS_H_
+