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

chrome/common/pref_names.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 "chrome/common/pref_names.h"
 
 #include "base/basictypes.h"
 #include "chrome/common/pref_font_webkit_names.h"
 
 namespace prefs {
@@ skipping 1103 matching lines @@
 const char kGoogleGeolocationAccessEnabled[] =
     "googlegeolocationaccess.enabled";
 #endif
 
 // The default audio capture device used by the Media content setting.
 const char kDefaultAudioCaptureDevice[] = "media.default_audio_capture_device";
 
 // The default video capture device used by the Media content setting.
 const char kDefaultVideoCaptureDevice[] = "media.default_video_capture_Device";
 
+// The salt used for creating random MediaSource IDs.
+const char kMediaDeviceIdSalt[] = "media.device_id_salt";
+
 // Preference to disable 3D APIs (WebGL, Pepper 3D).
 const char kDisable3DAPIs[] = "disable_3d_apis";
 
 // Whether to enable hyperlink auditing ("<a ping>").
 const char kEnableHyperlinkAuditing[] = "enable_a_ping";
 
 // Whether to enable sending referrers.
 const char kEnableReferrers[] = "enable_referrers";
 
 // Whether to send the DNT header.
@@ skipping 1445 matching lines @@
 // A dictionary pref which maps profile names to dictionary values which hold
 // hashes of profile prefs that we track to detect changes that happen outside
 // of Chrome.
 const char kProfilePreferenceHashes[] = "profile.preference_hashes";
 
 // Stores a pair of local time and corresponding network time to bootstrap
 // network time tracker when browser starts.
 const char kNetworkTimeMapping[] = "profile.network_time_mapping";
 
 }  // namespace prefs