Add more WebAPK install metrics

chrome/browser/android/webapk/webapk_metrics.h

 // Copyright 2016 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_ANDROID_WEBAPK_WEBAPK_METRICS_H_
 #define CHROME_BROWSER_ANDROID_WEBAPK_WEBAPK_METRICS_H_
 
 namespace base {
 class TimeDelta;
 }
@@ skipping 38 matching lines @@
   // Launch a previously installed WebAPK since the WebAPK has been installed on
   // the device before.
   USER_ACTION_OPEN,  // Obsolete
   USER_ACTION_OPEN_DISMISS,  // Obsolete
   // Open a newly installed WebAPK via a successful installation.
   USER_ACTION_INSTALLED_OPEN,
   USER_ACTION_INSTALLED_OPEN_DISMISS,
   USER_ACTION_MAX,
 };
 
+void TrackRequestTokenDuration(base::TimeDelta delta);
 void TrackInstallDuration(base::TimeDelta delta);
 void TrackInstallEvent(InstallEvent event);
 void TrackInstallSource(InstallSource event);
 void TrackInstallInfoBarShown(InfoBarShown event);
 void TrackUserAction(UserAction event);
 
 // On web app and WebAPK installation records whether a WebAPK could be
 // installed via the Google Play flow. If not, records why the WebAPK could not
 // be installed via the Google Play flow (and a web app was added to the
 // homescreen instead).
 // Warning: This metric is recorded whenever a site is added to the homescreeen
 // as a web app, not just for sites with a WebAPK compatible Web Manifest.
 void TrackGooglePlayInstallState(GooglePlayInstallState state);
 
 };  // namespace webapk
 
 #endif  // CHROME_BROWSER_ANDROID_WEBAPK_WEBAPK_METRICS_H_