Do not create WebAPK via add-to-homescreen menu item if manifest is not WebAPK-compatible

chrome/browser/android/webapps/add_to_homescreen_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/android/webapps/add_to_homescreen_data_fetcher.h"
 
 #include <vector>
 
 #include "base/bind.h"
 #include "base/callback.h"
 #include "base/location.h"
 #include "base/strings/string16.h"
 #include "chrome/browser/android/offline_pages/offline_page_utils.h"
 #include "chrome/browser/android/shortcut_helper.h"
+#include "chrome/browser/android/webapk/webapk_web_manifest_checker.h"
 #include "chrome/browser/favicon/favicon_service_factory.h"
 #include "chrome/browser/installable/installable_manager.h"
 #include "chrome/browser/manifest/manifest_icon_selector.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/common/chrome_constants.h"
 #include "chrome/common/render_messages.h"
 #include "chrome/common/web_application_info.h"
 #include "components/dom_distiller/core/url_utils.h"
 #include "components/favicon/core/favicon_service.h"
 #include "components/favicon_base/favicon_types.h"
@@ skipping 173 matching lines @@
     CreateLauncherIcon(SkBitmap());
 }
 
 void AddToHomescreenDataFetcher::OnDidPerformInstallableCheck(
     const InstallableData& data) {
   if (!web_contents() || !weak_observer_)
     return;
 
   is_installable_check_complete_ = true;
 
-  if (check_webapk_compatibility_)
-    weak_observer_->OnDidDetermineWebApkCompatibility(data.is_installable);
+  if (check_webapk_compatibility_) {
+    bool webapk_compatible =
+        (data.error_code == NO_ERROR_DETECTED &&
+         AreWebManifestUrlsWebApkCompatible(data.manifest));
+    weak_observer_->OnDidDetermineWebApkCompatibility(webapk_compatible);
+  }
 
   if (!data.manifest.IsEmpty()) {
     content::RecordAction(
         base::UserMetricsAction("webapps.AddShortcut.Manifest"));
     shortcut_info_.UpdateFromManifest(data.manifest);
     shortcut_info_.manifest_url = data.manifest_url;
   }
 
   // Save the splash screen URL for the later download.
   splash_screen_url_ = ManifestIconSelector::FindBestMatchingIcon(
@@ skipping 99 matching lines @@
 void AddToHomescreenDataFetcher::NotifyObserver(const SkBitmap& icon) {
   DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
   if (!web_contents() || !weak_observer_ || is_icon_saved_)
     return;
 
   is_icon_saved_ = true;
   shortcut_icon_ = icon;
   is_ready_ = true;
   weak_observer_->OnDataAvailable(shortcut_info_, shortcut_icon_);
 }