Support Audio for Desktop Capture

content/browser/renderer_host/media/media_stream_manager.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_manager.h"
 
 #include <stddef.h>
 #include <stdint.h>
 #include <string.h>
 #include <cctype>
@@ skipping 81 matching lines @@
     DCHECK(std::isalnum(c)) << c;
   }
   return label;
 }
 
 void ParseStreamType(const StreamControls& controls,
                      MediaStreamType* audio_type,
                      MediaStreamType* video_type) {
   *audio_type = MEDIA_NO_SERVICE;
   *video_type = MEDIA_NO_SERVICE;
+  const bool audio_support_flag_for_desktop_share =
+      base::CommandLine::ForCurrentProcess()->HasSwitch(
+          switches::kEnableAudioSupportForDesktopShare);
+
   if (controls.audio.requested) {
     if (!controls.audio.stream_source.empty()) {
        // This is tab or screen capture.
        if (controls.audio.stream_source == kMediaStreamSourceTab) {
          *audio_type = content::MEDIA_TAB_AUDIO_CAPTURE;
        } else if (controls.audio.stream_source == kMediaStreamSourceSystem) {
          *audio_type = content::MEDIA_DESKTOP_AUDIO_CAPTURE;
+       } else if (audio_support_flag_for_desktop_share &&
+                  controls.audio.stream_source == kMediaStreamSourceDesktop) {
+         *audio_type = content::MEDIA_DESKTOP_AUDIO_CAPTURE;
        }
      } else {
        // This is normal audio device capture.
        *audio_type = MEDIA_DEVICE_AUDIO_CAPTURE;
      }
   }
   if (controls.video.requested) {
     if (!controls.video.stream_source.empty()) {
       // This is tab or screen capture.
       if (controls.video.stream_source == kMediaStreamSourceTab) {
@@ skipping 1954 matching lines @@
     const std::string& device_guid,
     const std::string& raw_unique_id) {
   DCHECK(security_origin.is_valid());
   DCHECK(!raw_unique_id.empty());
   std::string guid_from_raw_device_id =
       GetHMACForMediaDeviceID(sc, security_origin, raw_unique_id);
   return guid_from_raw_device_id == device_guid;
 }
 
 }  // namespace content