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

chrome/browser/android/banners/app_banner_manager_android.cc

Index: chrome/browser/android/banners/app_banner_manager_android.cc
diff --git a/chrome/browser/android/banners/app_banner_manager_android.cc b/chrome/browser/android/banners/app_banner_manager_android.cc
index 697e9991872502b3cc071a32b77df0b51844a7f1..5556b543d17f8c9bbd6cef373ca76d9f5ff2808b 100644
--- a/chrome/browser/android/banners/app_banner_manager_android.cc
+++ b/chrome/browser/android/banners/app_banner_manager_android.cc
@@ -33,7 +33,7 @@ namespace banners {
 AppBannerManagerAndroid::AppBannerManagerAndroid(
     JNIEnv* env,
     jobject obj)
-    : AppBannerManager(),
+    : AppBannerManager(nullptr),
       weak_java_banner_view_manager_(env, obj) {
 }
 
@@ -185,9 +185,9 @@ bool AppBannerManagerAndroid::IsFetcherActive(
 void AppBannerManagerAndroid::RequestAppBanner(
     JNIEnv* env,
     const JavaParamRef<jobject>& obj) {
-  AppBannerManager::RequestAppBanner(web_contents()->GetMainFrame(),
-                                     web_contents()->GetLastCommittedURL(),
-                                     true);
+  // Set debug mode to true as this method is only called from DevTools.
+  AppBannerManager::RequestAppBanner(web_contents()->GetLastCommittedURL(),
+                                     true /* is_debug_mode */);
 }
 
 // static