Implementing sign-in promo histograms for settings

ios/chrome/browser/pref_names.cc

 // Copyright 2014 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.
 
 #include "ios/chrome/browser/pref_names.h"
 
 namespace prefs {
 
 // The value to use for Accept-Languages HTTP header when making an HTTP
 // request.
@@ skipping 51 matching lines @@
 
 // Preference that hold a boolean indicating if the user has already dismissed
 // the bookmark promo dialog.
 const char kIosBookmarkPromoAlreadySeen[] = "ios.bookmark.promo_already_seen";
 
 // Integer to represent the number of time the sign-in promo has been displayed
 // in the bookmark view.
 const char kIosBookmarkSigninPromoDisplayedCount[] =
     "ios.bookmark.signin_promo_displayed_count";
 
+// Integer to represent the number of time the sign-in promo has been displayed
+// in the settings view.
+const char kIosSettingsSigninPromoDisplayedCount[] =
+    "ios.settings.signin_promo_displayed_count";
+
 // Whether the user has enabled the Physical Web feature to surface URLs
 // broadcast by nearby devices.
 const char kIosPhysicalWebEnabled[] = "ios.physical_web_enabled";
 
 // True if the previous session exited cleanly.
 // This can be different from kStabilityExitedCleanly, because the last run of
 // the program may not have included a browsing session, and thus the last run
 // of the program may have happened after the run that included the last
 // session.
 const char kLastSessionExitedCleanly[] =
@@ skipping 85 matching lines @@
 
 // True if the user is eligible to recieve "desktop to iOS" promotion.
 const char kDesktopIOSPromotionEligible[] = "ios.desktoptomobileeligible";
 
 // Integer that represents which variation of title and text of the
 // "desktop to iOS" promotion was presented to the user on desktop.
 const char kDesktopIOSPromotionVariationId[] =
     "ios.desktop_ios_promo_variation_id";
 
 }  // namespace prefs