Check if a PWA is installed before checking the service worker and icon.

chrome/browser/banners/app_banner_manager.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_BANNERS_APP_BANNER_MANAGER_H_
 #define CHROME_BROWSER_BANNERS_APP_BANNER_MANAGER_H_
 
 #include <memory>
 #include <vector>
 
@@ skipping 86 matching lines @@
   // Overridden and passed through base::Bind on Android. Called after a web app
   // banner was successfully used to add a web app to homescreen to kick off an
   // asynchronous fetch of a splash screen icon. Not used on desktop platforms.
   virtual base::Closure FetchWebappSplashScreenImageCallback(
       const std::string& webapp_id);
 
  protected:
   explicit AppBannerManager(content::WebContents* web_contents);
   ~AppBannerManager() override;
 
+  // Returns true if the banner should be shown. Returns false if the banner has
+  // been shown too recently, or if the app has already been installed.
+  // GetAppIdentifier() must return a valid value for this method to work.
+  bool CheckIfShouldShowBanner();
+
   // Return a string identifying this app for metrics.
   virtual std::string GetAppIdentifier();
 
   // Return a string describing what type of banner is being created. Used when
   // alerting websites that a banner is about to be created.
   virtual std::string GetBannerType();
 
   // Returns a string parameter for a devtools console message corresponding to
   // |code|. Returns the empty string if |code| requires no parameter.
   std::string GetStatusParam(InstallableStatusCode code);
@@ skipping 97 matching lines @@
   friend class AppBannerManagerTest;
 
   // Record that the banner could be shown at this point, if the triggering
   // heuristic allowed.
   void RecordCouldShowBanner();
 
   // Creates a banner for the app. Overridden by subclasses as the infobar is
   // platform-specific.
   virtual void ShowBanner() = 0;
 
-  // Returns true if the banner should be shown.
-  bool CheckIfShouldShowBanner();
-
   // Called after the manager sends a message to the renderer regarding its
   // intention to show a prompt. The renderer will send a message back with the
   // opportunity to cancel.
   void OnBannerPromptReply(blink::mojom::AppBannerPromptReply reply,
                            const std::string& referrer);
 
   // blink::mojom::AppBannerService overrides.
   // Called when Blink has prevented a banner from being shown, and is now
   // requesting that it be shown later.
   void DisplayAppBanner() override;
@@ skipping 38 matching lines @@
   // scoped to the WebContents which they are observing. This allows us to use
   // weak pointers for callbacks.
   base::WeakPtrFactory<AppBannerManager> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(AppBannerManager);
 };
 
 }  // namespace banners
 
 #endif  // CHROME_BROWSER_BANNERS_APP_BANNER_MANAGER_H_