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

content/browser/renderer_host/media/media_stream_dispatcher_host.cc

 // 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.
 
 #include "content/browser/renderer_host/media/media_stream_dispatcher_host.h"
 
 #include "content/browser/browser_main_loop.h"
 #include "content/browser/renderer_host/media/web_contents_capture_util.h"
 #include "content/common/media/media_stream_messages.h"
 #include "content/common/media/media_stream_options.h"
 #include "url/gurl.h"
 
 namespace content {
 
 MediaStreamDispatcherHost::MediaStreamDispatcherHost(
     int render_process_id,
+    BrowserContext* browser_context,

[Jói, 2013/10/31 16:14:47]

Why not simply take a ResourceContext? No need for this object to know about
BrowserContext.

[perkj_chrome, 2013/10/31 17:05:44]

Done.

     MediaStreamManager* media_stream_manager)
     : render_process_id_(render_process_id),
+      resource_context_(browser_context->GetResourceContext()),
       media_stream_manager_(media_stream_manager) {
 }
 
 void MediaStreamDispatcherHost::StreamGenerated(
     const std::string& label,
     const StreamDeviceInfoArray& audio_devices,
     const StreamDeviceInfoArray& video_devices) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
   DVLOG(1) << "MediaStreamDispatcherHost::StreamGenerated("
            << ", {label = " << label <<  "})";
@@ skipping 95 matching lines @@
     const GURL& security_origin) {
   DVLOG(1) << "MediaStreamDispatcherHost::OnGenerateStream("
            << render_view_id << ", "
            << page_request_id << ", ["
            << " audio:" << components.audio_type
            << " video:" << components.video_type
            << " ], "
            << security_origin.spec() << ")";
 
   const std::string& label = media_stream_manager_->GenerateStream(
-      this, render_process_id_, render_view_id, page_request_id,
+      this, render_process_id_, render_view_id, resource_context_,
+      page_request_id,
       components, security_origin);
   CHECK(!label.empty());
   StoreRequest(render_view_id, page_request_id, label);
 }
 
 void MediaStreamDispatcherHost::OnCancelGenerateStream(int render_view_id,
                                                        int page_request_id) {
   DVLOG(1) << "MediaStreamDispatcherHost::OnCancelGenerateStream("
            << render_view_id << ", "
            << page_request_id << ")";
@@ skipping 24 matching lines @@
     int page_request_id,
     MediaStreamType type,
     const GURL& security_origin) {
   DVLOG(1) << "MediaStreamDispatcherHost::OnEnumerateDevices("
            << render_view_id << ", "
            << page_request_id << ", "
            << type << ", "
            << security_origin.spec() << ")";
 
   const std::string& label = media_stream_manager_->EnumerateDevices(
-      this, render_process_id_, render_view_id, page_request_id,
-      type, security_origin);
+      this, render_process_id_, render_view_id, resource_context_,
+      page_request_id, type, security_origin);
   StoreRequest(render_view_id, page_request_id, label);
 }
 
 void MediaStreamDispatcherHost::OnCancelEnumerateDevices(
     int render_view_id,
     const std::string& label) {
   DVLOG(1) << "MediaStreamDispatcherHost::OnCancelEnumerateDevices("
            << render_view_id << ", "
            << label << ")";
 
   media_stream_manager_->CancelRequest(label);
   PopRequest(label);
 }
 
 void MediaStreamDispatcherHost::OnOpenDevice(
     int render_view_id,
     int page_request_id,
     const std::string& device_id,
     MediaStreamType type,
     const GURL& security_origin) {
   DVLOG(1) << "MediaStreamDispatcherHost::OnOpenDevice("
            << render_view_id << ", "
            << page_request_id << ", device_id: "
            << device_id.c_str() << ", type: "
            << type << ", "
            << security_origin.spec() << ")";
 
   const std::string& label = media_stream_manager_->OpenDevice(
-      this, render_process_id_, render_view_id, page_request_id,
-      device_id, type, security_origin);
+      this, render_process_id_, render_view_id, resource_context_,
+      page_request_id, device_id, type, security_origin);
   StoreRequest(render_view_id, page_request_id, label);
 }
 
 void MediaStreamDispatcherHost::OnCloseDevice(
     int render_view_id,
     const std::string& label) {
   DVLOG(1) << "MediaStreamDispatcherHost::OnCloseDevice("
            << render_view_id << ", "
            << label << ")";
 
@@ skipping 12 matching lines @@
 MediaStreamDispatcherHost::StreamRequest
 MediaStreamDispatcherHost::PopRequest(const std::string& label) {
   StreamMap::iterator it = streams_.find(label);
   CHECK(it != streams_.end());
   StreamRequest request = it->second;
   streams_.erase(it);
   return request;
 }
 
 }  // namespace content