Refactor extension event distribution to use Values instead of JSON strings.

chrome/browser/history/history_extension_api.h

 // Copyright (c) 2012 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_HISTORY_HISTORY_EXTENSION_API_H_
 #define CHROME_BROWSER_HISTORY_HISTORY_EXTENSION_API_H_
 #pragma once
 
 #include <string>
 
 #include "base/compiler_specific.h"
 #include "chrome/browser/extensions/extension_function.h"
 #include "chrome/browser/history/history.h"
 #include "chrome/browser/history/history_notifications.h"
 #include "content/public/browser/notification_registrar.h"
 
+namespace base {
+class ListValue;
+}
+
 // Observes History service and routes the notifications as events to the
 // extension system.
 class HistoryExtensionEventRouter : public content::NotificationObserver {
  public:
   explicit HistoryExtensionEventRouter();
   virtual ~HistoryExtensionEventRouter();
 
   void ObserveProfile(Profile* profile);
 
  private:
   // content::NotificationObserver::Observe.
   virtual void Observe(int type,
                        const content::NotificationSource& source,
                        const content::NotificationDetails& details) OVERRIDE;
 
   void HistoryUrlVisited(Profile* profile,
                          const history::URLVisitedDetails* details);
 
   void HistoryUrlsRemoved(Profile* profile,
                           const history::URLsDeletedDetails* details);
 
   void DispatchEvent(Profile* profile,
                      const char* event_name,
-                     const std::string& json_args);
+                     base::ListValue* event_args);
 
   // Used for tracking registrations to history service notifications.
   content::NotificationRegistrar registrar_;
 
   DISALLOW_COPY_AND_ASSIGN(HistoryExtensionEventRouter);
 };
 
 
 // Base class for history function APIs.
 class HistoryFunction : public AsyncExtensionFunction {
@@ skipping 110 matching lines @@
   virtual ~DeleteRangeHistoryFunction() {}
 
   // HistoryFunctionWithCallback:
   virtual bool RunAsyncImpl() OVERRIDE;
 
   // Callback for the history service to acknowledge deletion.
   void DeleteComplete();
 };
 
 #endif  // CHROME_BROWSER_HISTORY_HISTORY_EXTENSION_API_H_