Allow only responsive websites to install as a web app on mobile.

chrome/browser/banners/app_banner_data_fetcher.cc

 // 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.
 
 #include "chrome/browser/banners/app_banner_data_fetcher.h"
 
 #include "base/bind.h"
 #include "base/strings/string_util.h"
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/browser/banners/app_banner_debug_log.h"
@@ skipping 223 matching lines @@
       if (weak_delegate_->HandleNonWebApp(platform, application.url, id))
         return;
     }
   }
 
   if (!IsManifestValidForWebApp(manifest, web_contents)) {
     Cancel();
     return;
   }
 
-  banners::TrackDisplayEvent(DISPLAY_EVENT_BANNER_REQUESTED);
-
   web_app_data_ = manifest;
   app_title_ = web_app_data_.name.string();
 
+  HandleWebApp(web_contents);
+}
+
+void AppBannerDataFetcher::HandleWebApp(content::WebContents* web_contents) {
+  banners::TrackDisplayEvent(DISPLAY_EVENT_BANNER_REQUESTED);
+
   // Check to see if there is a single service worker controlling this page
   // and the manifest's start url.
   Profile* profile =
       Profile::FromBrowserContext(web_contents->GetBrowserContext());
   content::StoragePartition* storage_partition =
       content::BrowserContext::GetStoragePartition(
           profile, web_contents->GetSiteInstance());
   DCHECK(storage_partition);
 
   storage_partition->GetServiceWorkerContext()->CheckHasServiceWorker(
-      validated_url_, manifest.start_url,
+      validated_url_, web_app_data_.start_url,
       base::Bind(&AppBannerDataFetcher::OnDidCheckHasServiceWorker,
                  this));
 }
 
 void AppBannerDataFetcher::OnDidCheckHasServiceWorker(
     bool has_service_worker) {
   content::WebContents* web_contents = GetWebContents();
   if (!CheckFetcherIsStillAlive(web_contents)) {
     Cancel();
     return;
@@ skipping 106 matching lines @@
     return false;
   }
   if (!DoesManifestContainRequiredIcon(manifest)) {
     OutputDeveloperNotShownMessage(web_contents, kManifestMissingSuitableIcon);
     return false;
   }
   return true;
 }
 
 }  // namespace banners