[Media Router] Add MediaSink subtypes

chrome/browser/media/router/BUILD.gn

Index: chrome/browser/media/router/BUILD.gn
diff --git a/chrome/browser/media/router/BUILD.gn b/chrome/browser/media/router/BUILD.gn
index 5e728ee6b958c0d0b4dcc014ec06ac63b867aa2b..77372c193ebb72c3712c29d1d70602bc7d74b56a 100644
--- a/chrome/browser/media/router/BUILD.gn
+++ b/chrome/browser/media/router/BUILD.gn
@@ -43,6 +43,8 @@ static_library("router") {
     "media_routes_observer.h",
     "media_sink.cc",
     "media_sink.h",
+    "media_sink_internal.cc",
+    "media_sink_internal.h",
     "media_sink_service.cc",
     "media_sink_service.h",
     "media_sinks_observer.cc",
@@ -104,10 +106,21 @@ mojom("mojo_bindings") {
 
   public_deps = [
     "//mojo/common:common_custom_types",
+    "//url/mojo:url_mojom_gurl",
     "//url/mojo:url_mojom_origin",
   ]
 }
 
+mojom("mojo_test_interfaces") {
+  sources = [
+    "mojo/media_router_traits_test_service.mojom",
+  ]
+
+  public_deps = [
+    ":mojo_bindings",
+  ]
+}
+
 static_library("test_support") {
   testonly = true
   deps = [
@@ -127,6 +140,7 @@ static_library("test_support") {
   if (!is_android) {
     deps += [
       ":mojo_bindings",
+      ":mojo_test_interfaces",
       "//extensions/common",
     ]
     sources += [