Allow the minimum time between banner trigger visits to be varied via field trials.

chrome/browser/banners/app_banner_manager.cc

 // Copyright 2015 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 "chrome/browser/banners/app_banner_manager.h"
 
 #include "chrome/browser/banners/app_banner_data_fetcher.h"
 #include "chrome/browser/banners/app_banner_debug_log.h"
 #include "chrome/browser/banners/app_banner_settings_helper.h"
 #include "content/public/browser/navigation_details.h"
@@ skipping 13 matching lines @@
 bool AppBannerManager::URLsAreForTheSamePage(const GURL& first,
                                              const GURL& second) {
   return first.GetWithEmptyPath() == second.GetWithEmptyPath() &&
          first.path() == second.path() && first.query() == second.query();
 }
 
 AppBannerManager::AppBannerManager(int icon_size)
     : ideal_icon_size_(icon_size),
       data_fetcher_(nullptr),
       weak_factory_(this) {
+  AppBannerSettingsHelper::UpdateMinutesBetweenVisits();
 }
 
 AppBannerManager::AppBannerManager(content::WebContents* web_contents,
                                    int icon_size)
     : content::WebContentsObserver(web_contents),
       ideal_icon_size_(icon_size),
       data_fetcher_(nullptr),
       weak_factory_(this) {
+  AppBannerSettingsHelper::UpdateMinutesBetweenVisits();
 }
 
 AppBannerManager::~AppBannerManager() {
   CancelActiveFetcher();
 }
 
 void AppBannerManager::DidCommitProvisionalLoadForFrame(
     content::RenderFrameHost* render_frame_host,
     const GURL& url,
     ui::PageTransition transition_type) {
@@ skipping 53 matching lines @@
 }
 
 void AppBannerManager::ForceEngagementWeightsForTesting(
     double direct_engagement,
     double indirect_engagement) {
   AppBannerSettingsHelper::SetEngagementWeights(direct_engagement,
                                                 indirect_engagement);
 }
 
 }  // namespace banners