webapps: initial addition of splash screen icon downloading

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 69d647e801219a4ca5e2d304d6819025094c777a..31206c12cd4ee2c0b8dee4b26e1c8254a61ff120 100644
--- a/chrome/browser/banners/app_banner_data_fetcher.h
+++ b/chrome/browser/banners/app_banner_data_fetcher.h
@@ -121,7 +121,7 @@ class AppBannerDataFetcher
 
   // Called when it is determined that the webapp has fulfilled the initial
   // criteria of having a manifest and a service worker.
-  void OnHasServiceWorker(content::WebContents* web_contents);
+  virtual void OnHasServiceWorker(content::WebContents* web_contents);
 
   content::WebContents* GetWebContents();
   virtual std::string GetAppIdentifier();
@@ -137,6 +137,10 @@ class AppBannerDataFetcher
   // metric being recorded.
   void RecordDidShowBanner(const std::string& event_name);
 
+  // Returns whether the fetcher is active and web contents have not been
+  // closed.
+  bool CheckFetcherIsStillAlive(content::WebContents* web_contents);
+
  private:
   // Callbacks for data retrieval.
   void OnDidGetManifest(const content::Manifest& manifest);
@@ -160,10 +164,6 @@ class AppBannerDataFetcher
   // Returns whether the banner should be shown.
   bool CheckIfShouldShowBanner();
 
-  // Returns whether the fetcher is active and web contents have not been
-  // closed.
-  bool CheckFetcherIsStillAlive(content::WebContents* web_contents);
-
   // Returns whether the given Manifest is following the requirements to show
   // a web app banner.
   static bool IsManifestValidForWebApp(const content::Manifest& manifest,