Do not hash default and communications media device ID

content/browser/renderer_host/media/media_stream_manager.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.
 
 // MediaStreamManager is used to open/enumerate media capture devices (video
 // supported now). Call flow:
 // 1. GenerateStream is called when a render process wants to use a capture
 //    device.
 // 2. MediaStreamManager will ask MediaStreamUIController for permission to
 //    use devices and for which device to use.
@@ skipping 195 matching lines @@
   void AddLogMessageOnIOThread(const std::string& message);
 
   // base::PowerObserver overrides.
   void OnSuspend() override;
   void OnResume() override;
 
   // Called by the tests to specify a fake UI that should be used for next
   // generated stream (or when using --use-fake-ui-for-media-stream).
   void UseFakeUIForTests(scoped_ptr<FakeMediaStreamUIProxy> fake_ui);
 
+  // Generates a hash of a device's unique ID usable by one
+  // particular security origin.
+  static std::string GetHMACForMediaDeviceID(
+      const ResourceContext::SaltCallback& sc,
+      const GURL& security_origin,
+      const std::string& raw_unique_id);
+
+  // Convenience method to check if |device_guid| is an HMAC of
+  // |raw_device_id| for |security_origin|.
+  static bool DoesMediaDeviceIDMatchHMAC(
+      const ResourceContext::SaltCallback& sc,
+      const GURL& security_origin,
+      const std::string& device_guid,
+      const std::string& raw_unique_id);
+
  private:
   // Contains all data needed to keep track of requests.
   class DeviceRequest;
 
   // Cache enumerated device list.
   struct EnumerationCache {
     EnumerationCache();
     ~EnumerationCache();
 
     bool valid;
@@ skipping 179 matching lines @@
 
   bool use_fake_ui_;
   scoped_ptr<FakeMediaStreamUIProxy> fake_ui_;
 
   DISALLOW_COPY_AND_ASSIGN(MediaStreamManager);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_MEDIA_MEDIA_STREAM_MANAGER_H_