Separate the syncing of extension settings and app settings into separate data

chrome/browser/extensions/extension_service.h

 // Copyright (c) 2011 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_EXTENSIONS_EXTENSION_SERVICE_H_
 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_SERVICE_H_
 #pragma once
 
 #include <map>
 #include <set>
@@ skipping 127 matching lines @@
 
   // The name of the directory inside the profile where extensions are
   // installed to.
   static const char* kInstallDirectoryName;
 
   // If auto-updates are turned on, default to running every 5 hours.
   static const int kDefaultUpdateFrequencySeconds = 60 * 60 * 5;
 
   // The name of the directory inside the profile where per-extension settings
   // are stored.
-  static const char* kSettingsDirectoryName;
+  static const char* kExtensionSettingsDirectoryName;
+
+  // The name of the directory inside the profile where per-app settings
+  // are stored.
+  static const char* kAppSettingsDirectoryName;
 
   // Determine if a given extension download should be treated as if it came
   // from the gallery. Note that this is requires *both* that the download_url
   // match and that the download was referred from a gallery page.
   bool IsDownloadFromGallery(const GURL& download_url,
                              const GURL& referrer_url);
 
   // Returns the Extension of hosted or packaged apps, NULL otherwise.
   const Extension* GetInstalledApp(const GURL& url);
 
@@ skipping 683 matching lines @@
   ExtensionWarningSet extension_warnings_;
 
   FRIEND_TEST_ALL_PREFIXES(ExtensionServiceTest,
                            InstallAppsWithUnlimtedStorage);
   FRIEND_TEST_ALL_PREFIXES(ExtensionServiceTest,
                            InstallAppsAndCheckStorageProtection);
   DISALLOW_COPY_AND_ASSIGN(ExtensionService);
 };
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_SERVICE_H_