Extension settings API: force through changes that come from sync (ignoring

chrome/browser/extensions/settings/settings_storage.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_SETTINGS_SETTINGS_STORAGE_H_
 #define CHROME_BROWSER_EXTENSIONS_SETTINGS_SETTINGS_STORAGE_H_
 #pragma once
 
 #include <set>
 
@@ skipping 71 matching lines @@
       const std::string error_;
 
      private:
       friend class base::RefCountedThreadSafe<Inner>;
       virtual ~Inner();
     };
 
     scoped_refptr<Inner> inner_;
   };
 
+  // Options for write operations.
+  enum WriteOptions {
+    // Callers should usually use this.
+    DEFAULTS,
+
+    // Ignore restrictions, such as quota.  It is still possible for the
+    // operation to fail, such as on hard drive failure or if the storage area
+    // is configured to fail.
+    FORCE
+  };
+
   virtual ~SettingsStorage() {}
 
   // Gets a single value from storage.
   virtual ReadResult Get(const std::string& key) = 0;
 
   // Gets multiple values from storage.
   virtual ReadResult Get(const std::vector<std::string>& keys) = 0;
 
   // Gets all values from storage.
   virtual ReadResult Get() = 0;
 
   // Sets a single key to a new value.
-  virtual WriteResult Set(const std::string& key, const Value& value) = 0;
+  virtual WriteResult Set(
+      WriteOptions options, const std::string& key, const Value& value) = 0;
 
   // Sets multiple keys to new values.
-  virtual WriteResult Set(const DictionaryValue& values) = 0;
+  virtual WriteResult Set(
+      WriteOptions options, const DictionaryValue& values) = 0;
 
   // Removes a key from the storage.
   virtual WriteResult Remove(const std::string& key) = 0;
 
   // Removes multiple keys from the storage.
   virtual WriteResult Remove(const std::vector<std::string>& keys) = 0;
 
   // Clears the storage.
   virtual WriteResult Clear() = 0;
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_SETTINGS_SETTINGS_STORAGE_H_