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

chrome/browser/banners/app_banner_settings_helper.h

 // 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.
 
 #ifndef CHROME_BROWSER_BANNERS_APP_BANNER_SETTINGS_HELPER_H_
 #define CHROME_BROWSER_BANNERS_APP_BANNER_SETTINGS_HELPER_H_
 
 #include <set>
 #include <string>
 #include <vector>
@@ skipping 99 matching lines @@
 
   // Get the recorded event for an event type that only records the last event.
   // Should not be used with APP_BANNER_EVENT_COULD_SHOW. This is only exposed
   // for testing.
   static base::Time GetSingleBannerEvent(
       content::WebContents* web_contents,
       const GURL& origin_url,
       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(
       content::WebContents* web_contents,
       const GURL& origin_url,
       const std::string& package_name_or_start_url,
       base::Time time);
 
   // Set the engagement weights assigned to direct and indirect navigations.
   static void SetEngagementWeights(double direct_engagement,
@@ skipping 21 matching lines @@
 
   // Returns true if the app banner trigger condition should use the site
   // engagement score instead of the navigation-based heuristic.
   static bool ShouldUseSiteEngagementScore();
 
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(AppBannerSettingsHelper);
 };
 
 #endif  // CHROME_BROWSER_BANNERS_APP_BANNER_SETTINGS_HELPER_H_