Check if there is a SW controlling the start page for app banner.

chrome/browser/android/banners/app_banner_manager.h

 // Copyright 2014 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_ANDROID_BANNERS_APP_BANNER_MANAGER_H_
 #define CHROME_BROWSER_ANDROID_BANNERS_APP_BANNER_MANAGER_H_
 
 #include "base/android/jni_android.h"
 #include "base/android/jni_weak_ref.h"
+#include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
+#include "base/memory/weak_ptr.h"
 #include "chrome/browser/android/banners/app_banner_infobar_delegate.h"
 #include "chrome/browser/bitmap_fetcher/bitmap_fetcher.h"
 #include "chrome/browser/ui/android/infobars/app_banner_infobar.h"
 #include "components/infobars/core/infobar_manager.h"
 #include "content/public/browser/web_contents_observer.h"
 #include "content/public/common/manifest.h"
 
 namespace content {
 struct FrameNavigateParams;
 struct LoadCommittedDetails;
@@ skipping 105 matching lines @@
 
   // Called when the renderer has returned information about the meta tag.
   // If there is some metadata for the play store tag, this kicks off the
   // process of showing a banner for the package designated by |tag_content| on
   // the page at the |expected_url|.
   void OnDidRetrieveMetaTagContent(bool success,
                                    const std::string& tag_name,
                                    const std::string& tag_content,
                                    const GURL& expected_url);
 
+  // Called when the result of the CheckHasServiceWorker query has completed.
+  void OnDidCheckHasServiceWorker(bool has_service_worker);
+
   // Fetches the icon for an app.
   scoped_ptr<chrome::BitmapFetcher> fetcher_;
   GURL validated_url_;
   GURL app_icon_url_;
 
   base::string16 app_title_;
   scoped_ptr<SkBitmap> app_icon_;
 
   content::Manifest web_app_data_;
 
   // Weak pointer to the InfoBar that is being managed.
   AppBannerInfoBar* weak_infobar_ptr_;
 
   // AppBannerManager on the Java side.
   JavaObjectWeakGlobalRef weak_java_banner_view_manager_;
 
+  // A weak pointer is used as the lifetime of the ServiceWorkerContext is
+  // longer than the lifetime of this banner manager. The banner manager
+  // might be gone when calls sent to the ServiceWorkerContext are completed.
+  base::WeakPtrFactory<AppBannerManager> weak_factory_;
+
   DISALLOW_COPY_AND_ASSIGN(AppBannerManager);
 };  // class AppBannerManager
 
 // Register native methods
 bool RegisterAppBannerManager(JNIEnv* env);
 
 }  // namespace banners
 
 #endif  // CHROME_BROWSER_ANDROID_BANNERS_APP_BANNER_MANAGER_H_