Begin adding support for tab mirroring via the MediaStream audio/video capturing

content/common/media/media_stream_options.cc

Index: content/common/media/media_stream_options.cc
diff --git a/content/common/media/media_stream_options.cc b/content/common/media/media_stream_options.cc
index 9daa96a54fad4628baa9c6a9c605aa2782b6da97..524bc203f87f44c647a380e7c7461b4576d5308f 100644
--- a/content/common/media/media_stream_options.cc
+++ b/content/common/media/media_stream_options.cc
@@ -4,13 +4,36 @@
 
 #include "content/common/media/media_stream_options.h"
 
+#include "base/logging.h"
+
 namespace media_stream {
 
+StreamOptions::StreamOptions()
+    : audio_type(content::MEDIA_NO_SERVICE),
+      video_type(content::MEDIA_NO_SERVICE) {}
+
+StreamOptions::StreamOptions(bool user_audio, bool user_video)
+    : audio_type(user_audio ?
+                     content::MEDIA_DEVICE_AUDIO_CAPTURE :
+                     content::MEDIA_NO_SERVICE),
+      video_type(user_video ?
+                     content::MEDIA_DEVICE_VIDEO_CAPTURE :
+                     content::MEDIA_NO_SERVICE) {}
+
+StreamOptions::StreamOptions(MediaStreamType audio_type,
+                             MediaStreamType video_type)
+    : audio_type(audio_type), video_type(video_type) {
+  DCHECK(IsAudioMediaType(audio_type) ||
+         audio_type == content::MEDIA_NO_SERVICE);
+  DCHECK(IsVideoMediaType(video_type) ||
+         video_type == content::MEDIA_NO_SERVICE);
+}
+
 // static
 const int StreamDeviceInfo::kNoId = -1;
 
 StreamDeviceInfo::StreamDeviceInfo()
-    : stream_type(content::MEDIA_STREAM_DEVICE_TYPE_NO_SERVICE),
+    : stream_type(content::MEDIA_NO_SERVICE),
       in_use(false),
       session_id(kNoId) {}