Allow variations controls for the time banners are suppressed after ignore/dismiss.

chrome/browser/banners/app_banner_settings_helper.h

Index: chrome/browser/banners/app_banner_settings_helper.h
diff --git a/chrome/browser/banners/app_banner_settings_helper.h b/chrome/browser/banners/app_banner_settings_helper.h
index bfa4577c6968cfc0a88aad66bb474eecf07706f6..034083f7dcafade170a9dda95d21f6709f6fb8f9 100644
--- a/chrome/browser/banners/app_banner_settings_helper.h
+++ b/chrome/browser/banners/app_banner_settings_helper.h
@@ -145,6 +145,11 @@ class AppBannerSettingsHelper {
                                   const GURL& origin_url,
                                   base::Time now);
 
+  // Set the number of days which dismissing/ignoring the banner should prevent
+  // a banner from showing.
+  static void SetDaysAfterDismissAndIgnoreToTrigger(unsigned int dismiss_days,
+                                                    unsigned int ignore_days);
+
   // Set the engagement weights assigned to direct and indirect navigations.
   static void SetEngagementWeights(double direct_engagement,
                                    double indirect_engagement);