[Media Router] Add MediaSink subtypes

chrome/browser/media/router/mojo/media_router.mojom

Index: chrome/browser/media/router/mojo/media_router.mojom
diff --git a/chrome/browser/media/router/mojo/media_router.mojom b/chrome/browser/media/router/mojo/media_router.mojom
index e26170d891ef309a70ee3b90f3a0097639aae6cb..f9072db62cdbc65b1512e91dbf3e3649d0c7084a 100644
--- a/chrome/browser/media/router/mojo/media_router.mojom
+++ b/chrome/browser/media/router/mojo/media_router.mojom
@@ -5,6 +5,7 @@
 module media_router.mojom;
 
 import "mojo/common/time.mojom";
+import "url/mojo/url.mojom";
 
 // Represents an output sink to which media can be routed.
 struct MediaSink {
@@ -26,6 +27,35 @@ struct MediaSink {
   string? domain;
   // The type of icon to show in the UI for this media sink.
   IconType icon_type;
+
+  // Used for feedback

[imcheng, 2017/02/08 01:28:09]

Replace the "Used for XXX" with a description of what the field represents. The
"Used for XXX" in the design doc are for my own / readers' information on why we
are adding the field. :)

[zhaobin, 2017/02/09 00:13:52]

Done.

+  string? model_name;
+
+  MediaSinkExtraData? extra_data;
+};
+
+union MediaSinkExtraData {
+  DialMediaSink dial_media_sink;
+  CastMediaSink cast_media_sink;
+};
+
+struct DialMediaSink {
+  // Used for feedback
+  string ip_address;
+
+  // Used for DIAL launch
+  url.mojom.Url app_url;
+};
+
+struct CastMediaSink {
+  int32 capabilities;
+
+  // Used for feedback
+  string ip_address;
+
+  // ID of cast channel opened by Media Router. The ID can be
+  // used to send call chrome.cast.channel.send.
+  int32 cast_channel_id;
 };
 
 // Should be kept in sync with media_route.h.