[Media Router] Add CastMediaSinkService

chrome/browser/media/router/discovery/BUILD.gn

Index: chrome/browser/media/router/discovery/BUILD.gn
diff --git a/chrome/browser/media/router/discovery/BUILD.gn b/chrome/browser/media/router/discovery/BUILD.gn
index 88825819db3050cb062f61c25a1e7136d212a37a..36819d8647dafb14bb9cec33201257e745da937b 100644
--- a/chrome/browser/media/router/discovery/BUILD.gn
+++ b/chrome/browser/media/router/discovery/BUILD.gn
@@ -12,6 +12,7 @@ static_library("discovery") {
     "//base:i18n",
     "//chrome/app:generated_resources",
     "//chrome/common:constants",
+    "//components/cast_channel",
     "//content/public/browser",
     "//content/public/common",
   ]
@@ -34,6 +35,8 @@ static_library("discovery") {
     "dial/parsed_dial_device_description.h",
     "dial/safe_dial_device_description_parser.cc",
     "dial/safe_dial_device_description_parser.h",
+    "mdns/cast_media_sink_service.cc",
+    "mdns/cast_media_sink_service.h",
     "mdns/dns_sd_delegate.cc",
     "mdns/dns_sd_delegate.h",
     "mdns/dns_sd_device_lister.cc",