Browser-wide audio mirroring for TabCapture API

content/browser/renderer_host/media/web_contents_capture_util.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_WEB_CONTENTS_CAPTURE_UTIL_H_
 #define CONTENT_BROWSER_RENDERER_HOST_MEDIA_WEB_CONTENTS_CAPTURE_UTIL_H_
 
 #include <string>
 
 namespace content {
 
 class WebContentsCaptureUtil {
  public:
+  // Returns a new id after appending the device id scheme for virtual streams.
+  static std::string AppendWebContentsDeviceScheme(
+      const std::string& device_id_param);
+
+  static std::string StripWebContentsDeviceScheme(
+      const std::string& device_id_param);
+
+  // Check whether the device id indicates that this is a web contents stream.
+  static bool IsWebContentsDeviceId(const std::string& device_id);
+
   // Function to extract the target renderer id's from a tab media stream
   // request's device id.
   static bool ExtractTabCaptureTarget(const std::string& device_id,
                                       int* render_process_id,
                                       int* render_view_id);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_MEDIA_WEB_CONTENTS_CAPTURE_UTIL_H_