Allow direct and indirect navigation values to be varied via field trial.

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 777ef1ae514c4a6ed9f549fe54c85f76a423160d..0f5efab72a203974b3e215b03b76f616d524cee4 100644
--- a/chrome/browser/banners/app_banner_manager.cc
+++ b/chrome/browser/banners/app_banner_manager.cc
@@ -31,7 +31,7 @@ AppBannerManager::AppBannerManager(int icon_size)
     : ideal_icon_size_(icon_size),
       data_fetcher_(nullptr),
       weak_factory_(this) {
-  AppBannerSettingsHelper::UpdateMinutesBetweenVisits();
+  AppBannerSettingsHelper::UpdateFromFieldTrial();
 }
 
 AppBannerManager::AppBannerManager(content::WebContents* web_contents,
@@ -40,7 +40,7 @@ AppBannerManager::AppBannerManager(content::WebContents* web_contents,
       ideal_icon_size_(icon_size),
       data_fetcher_(nullptr),
       weak_factory_(this) {
-  AppBannerSettingsHelper::UpdateMinutesBetweenVisits();
+  AppBannerSettingsHelper::UpdateFromFieldTrial();
 }
 
 AppBannerManager::~AppBannerManager() {
@@ -106,9 +106,8 @@ void AppBannerManager::DisableSecureSchemeCheckForTesting() {
   gDisableSecureCheckForTesting = true;
 }
 
-void AppBannerManager::ForceEngagementWeightsForTesting(
-    double direct_engagement,
-    double indirect_engagement) {
+void AppBannerManager::SetEngagementWeights(double direct_engagement,
+                                            double indirect_engagement) {
   AppBannerSettingsHelper::SetEngagementWeights(direct_engagement,
                                                 indirect_engagement);
 }