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

chrome/browser/banners/app_banner_manager.cc

Index: chrome/browser/banners/app_banner_manager.cc
diff --git a/chrome/browser/banners/app_banner_manager.cc b/chrome/browser/banners/app_banner_manager.cc
index ecbdac5a06e75ce0d16e4d404c051f1ac95447fd..777ef1ae514c4a6ed9f549fe54c85f76a423160d 100644
--- a/chrome/browser/banners/app_banner_manager.cc
+++ b/chrome/browser/banners/app_banner_manager.cc
@@ -31,6 +31,7 @@ AppBannerManager::AppBannerManager(int icon_size)
     : ideal_icon_size_(icon_size),
       data_fetcher_(nullptr),
       weak_factory_(this) {
+  AppBannerSettingsHelper::UpdateMinutesBetweenVisits();
 }
 
 AppBannerManager::AppBannerManager(content::WebContents* web_contents,
@@ -39,6 +40,7 @@ AppBannerManager::AppBannerManager(content::WebContents* web_contents,
       ideal_icon_size_(icon_size),
       data_fetcher_(nullptr),
       weak_factory_(this) {
+  AppBannerSettingsHelper::UpdateMinutesBetweenVisits();
 }
 
 AppBannerManager::~AppBannerManager() {