Extension syncing: Introduce a NeedsSync pref

extensions/browser/extension_prefs.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 EXTENSIONS_BROWSER_EXTENSION_PREFS_H_
 #define EXTENSIONS_BROWSER_EXTENSION_PREFS_H_
 
 #include <set>
 #include <string>
 #include <vector>
@@ skipping 513 matching lines @@
   // The installation parameter associated with the extension.
   std::string GetInstallParam(const std::string& extension_id) const;
   void SetInstallParam(const std::string& extension_id,
                        const std::string& install_parameter);
 
   // The total number of times we've disabled an extension due to corrupted
   // contents.
   int GetCorruptedDisableCount() const;
   void IncrementCorruptedDisableCount();
 
+  // Whether the extension with the given |id| needs to be synced. This is set
+  // when the state (such as enabled/disabled or allowed in incognito) is
+  // changed before Sync is ready.
+  bool NeedsSync(const std::string& extension_id) const;
+  void SetNeedsSync(const std::string& extension_id, bool needs_sync);
+
  private:
   friend class ExtensionPrefsBlacklistedExtensions;  // Unit test.
   friend class ExtensionPrefsComponentExtension;     // Unit test.
   friend class ExtensionPrefsUninstallExtension;     // Unit test.
 
   enum DisableReasonChange {
     DISABLE_REASON_ADD,
     DISABLE_REASON_REMOVE,
     DISABLE_REASON_CLEAR
   };
@@ skipping 139 matching lines @@
   bool extensions_disabled_;
 
   base::ObserverList<ExtensionPrefsObserver> observer_list_;
 
   DISALLOW_COPY_AND_ASSIGN(ExtensionPrefs);
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_BROWSER_EXTENSION_PREFS_H_