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

chrome/browser/profiles/profile_io_data.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_PROFILES_PROFILE_IO_DATA_H_
 #define CHROME_BROWSER_PROFILES_PROFILE_IO_DATA_H_
 
 #include <string>
 
 #include "base/basictypes.h"
@@ skipping 15 matching lines @@
 #include "net/http/http_network_session.h"
 #include "net/url_request/url_request_job_factory.h"
 
 class ChromeHttpUserAgentSettings;
 class ChromeNetworkDelegate;
 class CookieSettings;
 class DesktopNotificationService;
 class ExtensionInfoMap;
 class HostContentSettingsMap;
 class ManagedModeURLFilter;
+class MediaDeviceIDSalt;
 class Profile;
 class ProtocolHandlerRegistry;
 class SigninNamesOnIOThread;
 class TransportSecurityPersister;
 
 namespace chrome_browser_net {
 class LoadTimeStats;
 class ResourcePrefetchPredictorObserver;
 }
 
@@ skipping 120 matching lines @@
   }
 
   BooleanPrefMember* sync_disabled() const {
     return &sync_disabled_;
   }
 
   BooleanPrefMember* signin_allowed() const {
     return &signin_allowed_;
   }
 
+  std::string GetMediaDeviceIDSalt() const;
+
   net::TransportSecurityState* transport_security_state() const {
     return transport_security_state_.get();
   }
 
   bool is_incognito() const {
     return is_incognito_;
   }
 
   chrome_browser_net::ResourcePrefetchPredictorObserver*
       resource_prefetch_predictor_observer() const {
@@ skipping 171 matching lines @@
    public:
     explicit ResourceContext(ProfileIOData* io_data);
     virtual ~ResourceContext();
 
     // ResourceContext implementation:
     virtual net::HostResolver* GetHostResolver() OVERRIDE;
     virtual net::URLRequestContext* GetRequestContext() OVERRIDE;
     virtual scoped_ptr<net::ClientCertStore> CreateClientCertStore() OVERRIDE;
     virtual bool AllowMicAccess(const GURL& origin) OVERRIDE;
     virtual bool AllowCameraAccess(const GURL& origin) OVERRIDE;
+    virtual std::string GetMediaDeviceIDSalt() OVERRIDE;
 
    private:
     friend class ProfileIOData;
 
     // Helper method that returns true if |type| is allowed for |origin|, false
     // otherwise.
     bool AllowContentAccess(const GURL& origin, ContentSettingsType type);
 
     ProfileIOData* const io_data_;
 
@@ skipping 80 matching lines @@
   mutable StringPrefMember google_services_username_;
   mutable StringPrefMember google_services_username_pattern_;
   mutable BooleanPrefMember reverse_autologin_enabled_;
 
   // During the reverse autologin request chain processing, this member saves
   // the email of the google account that is being signed into.
   std::string reverse_autologin_pending_email_;
 
   mutable StringListPrefMember one_click_signin_rejected_email_list_;
 
+  mutable scoped_ptr<MediaDeviceIDSalt> media_device_id_salt_;
+
   // Member variables which are pointed to by the various context objects.
   mutable BooleanPrefMember enable_referrers_;
   mutable BooleanPrefMember enable_do_not_track_;
   mutable BooleanPrefMember force_safesearch_;
   mutable BooleanPrefMember safe_browsing_enabled_;
   mutable BooleanPrefMember printing_enabled_;
   mutable BooleanPrefMember sync_disabled_;
   mutable BooleanPrefMember signin_allowed_;
   // TODO(marja): Remove session_startup_pref_ if no longer needed.
   mutable IntegerPrefMember session_startup_pref_;
@@ skipping 59 matching lines @@
 
   // TODO(jhawkins): Remove once crbug.com/102004 is fixed.
   bool initialized_on_UI_thread_;
 
   bool is_incognito_;
 
   DISALLOW_COPY_AND_ASSIGN(ProfileIOData);
 };
 
 #endif  // CHROME_BROWSER_PROFILES_PROFILE_IO_DATA_H_