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..0915b5d0e98179d0ce7ee05238883220a8029b73 100644
--- a/content/common/media/media_stream_options.cc
+++ b/content/common/media/media_stream_options.cc
@@ -4,8 +4,33 @@
 
 #include "content/common/media/media_stream_options.h"
 
+#include "base/logging.h"
+
 namespace media_stream {
 
+StreamOptions::StreamOptions()
+    : audio_type(content::MEDIA_STREAM_DEVICE_TYPE_NO_SERVICE),
+      video_type(content::MEDIA_STREAM_DEVICE_TYPE_NO_SERVICE) {}
+
+StreamOptions::StreamOptions(bool user_audio, bool user_video)
+    : audio_type(user_audio ?
+                     content::MEDIA_STREAM_DEVICE_TYPE_USER_AUDIO_CAPTURE :
+                     content::MEDIA_STREAM_DEVICE_TYPE_NO_SERVICE),
+      video_type(user_video ?
+                     content::MEDIA_STREAM_DEVICE_TYPE_USER_VIDEO_CAPTURE :
+                     content::MEDIA_STREAM_DEVICE_TYPE_NO_SERVICE) {}
+
+StreamOptions::StreamOptions(MediaStreamType audio_type,
+                             MediaStreamType video_type,
+                             const std::string& opt_device_id)
+    : audio_type(audio_type), video_type(video_type),
+      opt_device_id(opt_device_id) {
+  DCHECK(IsAudioMediaStreamDeviceType(audio_type) ||
+         audio_type == content::MEDIA_STREAM_DEVICE_TYPE_NO_SERVICE);
+  DCHECK(IsVideoMediaStreamDeviceType(video_type) ||
+         video_type == content::MEDIA_STREAM_DEVICE_TYPE_NO_SERVICE);
+}
+
 // static
 const int StreamDeviceInfo::kNoId = -1;