Update WebAPKs even if the WebAPK start URL has no Web Manifest

chrome/browser/android/webapk/webapk_update_data_fetcher.h

 // Copyright 2016 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_WEBAPK_WEBAPK_UPDATE_DATA_FETCHER_H_
 #define CHROME_BROWSER_ANDROID_WEBAPK_WEBAPK_UPDATE_DATA_FETCHER_H_
 
 #include "base/android/jni_android.h"
 #include "base/android/jni_weak_ref.h"
 #include "base/macros.h"
@@ skipping 50 matching lines @@
   // Called once the installable data has been fetched.
   void OnDidGetInstallableData(const InstallableData& installable_data);
 
   // Called with the computed Murmur2 hash for the app icon.
   void OnGotIconMurmur2Hash(const std::string& best_icon_murmur2_hash);
 
   void OnDataAvailable(const ShortcutInfo& info,
                        const std::string& best_icon_murmur2_hash,
                        const SkBitmap& best_icon);
 
+  // Called when a page has no Web Manifest or the Web Manifest is not WebAPK
+  // compatible.
+  void OnWebManifestNotWebApkCompatible();
+
   // Points to the Java object.
   base::android::ScopedJavaGlobalRef<jobject> java_ref_;
 
   // The detector will only fetch the URL within the scope of the WebAPK.
   const GURL scope_;
 
   // The WebAPK's Web Manifest URL that the detector is looking for.
   const GURL web_manifest_url_;
 
+  // Whether this is the initial URL fetch.
+  bool is_initial_fetch_;
+
   // The URL for which the installable data is being fetched / was last fetched.
   GURL last_fetched_url_;
 
   // Downloads app icon and computes Murmur2 hash.
   std::unique_ptr<WebApkIconHasher> icon_hasher_;
 
   // Downloaded data for |web_manifest_url_|.
   ShortcutInfo info_;
   SkBitmap best_icon_;
 
   base::WeakPtrFactory<WebApkUpdateDataFetcher> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(WebApkUpdateDataFetcher);
 };
 
 #endif  // CHROME_BROWSER_ANDROID_WEBAPK_WEBAPK_UPDATE_DATA_FETCHER_H_