[Media Router] Add MediaSink subtypes

chrome/browser/media/router/media_sink.cc

Index: chrome/browser/media/router/media_sink.cc
diff --git a/chrome/browser/media/router/media_sink.cc b/chrome/browser/media/router/media_sink.cc
index 1e4892f7408b0a5b25d84d04df3ed6f48f7e9237..b900997f086a71515279969bfacb11c226168698 100644
--- a/chrome/browser/media/router/media_sink.cc
+++ b/chrome/browser/media/router/media_sink.cc
@@ -12,7 +12,10 @@ namespace media_router {
 MediaSink::MediaSink(const MediaSink::Id& sink_id,
                      const std::string& name,
                      const MediaSink::IconType icon_type)
-    : sink_id_(sink_id), name_(name), icon_type_(icon_type) {}
+    : type_(SinkType::GENERAL),

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

We can define a protected MediaSink constructor that takes a SinkType in
addition to the existing 3 arguments. Then this constructor and the Dial / Cast
MediaSink constructors can call it. WDYT?

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

Done.

+      sink_id_(sink_id),
+      name_(name),
+      icon_type_(icon_type) {}
 
 MediaSink::MediaSink(const MediaSink& other) = default;