Add a new WebAPK-specific app banner shortcut source.

chrome/browser/android/webapps/add_to_homescreen_manager.cc

Index: chrome/browser/android/webapps/add_to_homescreen_manager.cc
diff --git a/chrome/browser/android/webapps/add_to_homescreen_manager.cc b/chrome/browser/android/webapps/add_to_homescreen_manager.cc
index 822513778ba7058da78a23735100cd0a1bbf2398..de54a12c9a240f2a50ead1590346d11d1b99e72d 100644
--- a/chrome/browser/android/webapps/add_to_homescreen_manager.cc
+++ b/chrome/browser/android/webapps/add_to_homescreen_manager.cc
@@ -196,7 +196,8 @@ void AddToHomescreenManager::CreateInfoBarForWebApk(
   banners::AppBannerInfoBarDelegateAndroid::Create(
       web_contents, app_banner_manager->GetWeakPtr(), info.user_title,
       base::MakeUnique<ShortcutInfo>(info), primary_icon, badge_icon,
-      -1 /* event_request_id */, webapk::INSTALL_SOURCE_MENU);
+      -1 /* event_request_id */, true /* is_webapk */,
+      webapk::INSTALL_SOURCE_MENU);
 }
 
 SkBitmap AddToHomescreenManager::FinalizeLauncherIconInBackground(