Extension Settings API: throttle the API in the same way that the Bookmarks API

chrome/browser/extensions/extension_function.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_FUNCTION_H_
 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_FUNCTION_H_
 #pragma once
 
 #include <list>
 #include <string>
@@ skipping 64 matching lines @@
   // SetArgs(), set_request_id(), and the other setters before calling this
   // method. Derived classes should be ready to return GetResult() and
   // GetError() before returning from this function.
   // Note that once Run() returns, dispatcher() can be NULL, so be sure to
   // NULL-check.
   virtual void Run();
 
   // Returns a quota limit heuristic suitable for this function.
   // No quota limiting by default.
   virtual void GetQuotaLimitHeuristics(
-      std::list<QuotaLimitHeuristic*>* heuristics) const {}
+      QuotaLimitHeuristics* heuristics) const {}
 
   // Called when the quota limit has been exceeded. The default implementation
   // returns an error.
   virtual void OnQuotaExceeded();
 
   // Specifies the raw arguments to the function, as a JSON value.
   virtual void SetArgs(const base::ListValue* args);
 
   // Retrieves the results of the function as a JSON-encoded string (may
   // be empty).
@@ skipping 285 matching lines @@
  public:
   SyncIOThreadExtensionFunction();
 
   virtual void Run() OVERRIDE;
 
  protected:
   virtual ~SyncIOThreadExtensionFunction();
 };
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_FUNCTION_H_