Implement a salt for MediaSource IDs that can be cleared by a user.

content/browser/renderer_host/media/media_stream_dispatcher_host.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 CONTENT_BROWSER_RENDERER_HOST_MEDIA_MEDIA_STREAM_DISPATCHER_HOST_H_
 #define CONTENT_BROWSER_RENDERER_HOST_MEDIA_MEDIA_STREAM_DISPATCHER_HOST_H_
 
 #include <map>
 #include <string>
 #include <utility>
 
 #include "content/browser/renderer_host/media/media_stream_manager.h"
 #include "content/browser/renderer_host/media/media_stream_requester.h"
 #include "content/common/content_export.h"
 #include "content/common/media/media_stream_options.h"
+#include "content/public/browser/browser_context.h"
 #include "content/public/browser/browser_message_filter.h"
 
 namespace content {
+
+class BrowserContext;
 class MediaStreamManager;
 
 // MediaStreamDispatcherHost is a delegate for Media Stream API messages used by
 // MediaStreamImpl. It's the complement of MediaStreamDispatcher
 // (owned by RenderView).
 class CONTENT_EXPORT MediaStreamDispatcherHost : public BrowserMessageFilter,
                                                  public MediaStreamRequester {
  public:
   MediaStreamDispatcherHost(int render_process_id,
+                            BrowserContext* browser_context,
                             MediaStreamManager* media_stream_manager);
 
   // MediaStreamRequester implementation.
   virtual void StreamGenerated(
       const std::string& label,
       const StreamDeviceInfoArray& audio_devices,
       const StreamDeviceInfoArray& video_devices) OVERRIDE;
   virtual void StreamGenerationFailed(const std::string& label) OVERRIDE;
   virtual void StopGeneratedStream(int render_view_id,
                                    const std::string& label) OVERRIDE;
@@ skipping 50 matching lines @@
 
   void OnCloseDevice(int render_view_id,
                      const std::string& label);
 
   void StoreRequest(int render_view_id,
                     int page_request_id,
                     const std::string& label);
   StreamRequest PopRequest(const std::string& label);
 
   int render_process_id_;
+  ResourceContext* resource_context_;
   MediaStreamManager* media_stream_manager_;
 
   // Active requests. When the MediaStreamManager responds to a a request the
   // request is removed from this map.
   StreamMap streams_;
 
   DISALLOW_COPY_AND_ASSIGN(MediaStreamDispatcherHost);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_MEDIA_MEDIA_STREAM_DISPATCHER_HOST_H_