Log messages regarding why app banners aren't displayed to the console

chrome/browser/banners/app_banner_data_fetcher.h

Index: chrome/browser/banners/app_banner_data_fetcher.h
diff --git a/chrome/browser/banners/app_banner_data_fetcher.h b/chrome/browser/banners/app_banner_data_fetcher.h
index ce6d8e3013fe178b19e22b6ac4aabc99beaf38dd..d4b7133f2338e23621be380404ccee1f5f48c500 100644
--- a/chrome/browser/banners/app_banner_data_fetcher.h
+++ b/chrome/browser/banners/app_banner_data_fetcher.h
@@ -137,6 +137,10 @@ class AppBannerDataFetcher
   // Returns whether the banner should be shown.
   bool CheckIfShouldShowBanner();
 
+  // Logs a debug message to the main console if a banner could not be shown
+  // and the engagement checks have been bypassed.
+  void SendDebugMessage(const std::string& message);
+
   // Returns whether the given Manifest is following the requirements to show
   // a web app banner.
   static bool IsManifestValidForWebApp(const content::Manifest& manifest);
@@ -145,6 +149,7 @@ class AppBannerDataFetcher
   const base::WeakPtr<Delegate> weak_delegate_;
   ObserverList<Observer> observer_list_;
   bool is_active_;
+  bool log_err_;
   scoped_ptr<chrome::BitmapFetcher> bitmap_fetcher_;
   scoped_ptr<SkBitmap> app_icon_;