Allow app banners to be triggered by increases in site engagement.

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 f1e9ab12f3261a90c85d9eec191cfd167463667a..42dfdbb198a1a39394a2b2159f6afb02fbf8a928 100644
--- a/chrome/browser/banners/app_banner_settings_helper.h
+++ b/chrome/browser/banners/app_banner_settings_helper.h
@@ -117,6 +117,11 @@ class AppBannerSettingsHelper {
       const std::string& package_name_or_start_url,
       AppBannerEvent event);
 
+  // Returns true if |total_engagement| is sufficiently high to warrant
+  // triggering a banner, or if the command-line flag to bypass engagement
+  // checking is true.
+  static bool HasSufficientEngagement(double total_engagement);
+
   // Record a UMA statistic measuring the minutes between the first visit to the
   // site and the first showing of the banner.
   static void RecordMinutesFromFirstVisitToShow(