Make sure that a given app/extension requests only its own resources.

chrome/browser/extensions/api/api_resource_event_notifier.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_EXTENSIONS_API_API_RESOURCE_EVENT_NOTIFIER_H_
 #define CHROME_BROWSER_EXTENSIONS_API_API_RESOURCE_EVENT_NOTIFIER_H_
 
 #include <string>
 
 #include "base/basictypes.h"
@@ skipping 15 matching lines @@
   API_RESOURCE_EVENT_TRANSFER_COMPLETE,
 };
 
 extern const char kSrcIdKey[];
 
 // ApiResourceEventNotifier knows how to send an event to a specific app's
 // onEvent handler.
 class ApiResourceEventNotifier
     : public base::RefCountedThreadSafe<ApiResourceEventNotifier> {
  public:
-  ApiResourceEventNotifier(EventRouter* router,
-                           Profile* profile,
+  ApiResourceEventNotifier(EventRouter* router, Profile* profile,
                            const std::string& src_extension_id, int src_id,
                            const GURL& src_url);
 
   virtual void OnTransferComplete(UsbTransferStatus status,
                                   const std::string& error,
                                   base::BinaryValue* data);
 
   static std::string ApiResourceEventTypeToString(
       ApiResourceEventType event_type);
 
+  const std::string& src_extension_id() const { return src_extension_id_; }
+
  private:
   friend class base::RefCountedThreadSafe<ApiResourceEventNotifier>;
   friend class MockApiResourceEventNotifier;
 
   virtual ~ApiResourceEventNotifier();
 
   void DispatchEvent(const std::string &extension, DictionaryValue* event);
   void DispatchEventOnUIThread(const std::string& extension,
                                DictionaryValue* event);
   DictionaryValue* CreateApiResourceEvent(ApiResourceEventType event_type);
 
   void SendEventWithResultCode(const std::string& extension,
                                ApiResourceEventType event_type,
                                int result_code);
 
   EventRouter* router_;
   Profile* profile_;
   std::string src_extension_id_;
   int src_id_;
   GURL src_url_;
 
   DISALLOW_COPY_AND_ASSIGN(ApiResourceEventNotifier);
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_API_API_RESOURCE_EVENT_NOTIFIER_H_