[Media Router] Add DialMediaSinkService and DeviceDescriptionService

chrome/test/BUILD.gn

Index: chrome/test/BUILD.gn
diff --git a/chrome/test/BUILD.gn b/chrome/test/BUILD.gn
index afcda37a6d62b42e182d2664511206cf41b8e3b3..0a7dfb75b4e84d4387ab5d574b19f293afa9dbcf 100644
--- a/chrome/test/BUILD.gn
+++ b/chrome/test/BUILD.gn
@@ -4426,6 +4426,7 @@ test("unit_tests") {
       "../browser/media/router/browser_presentation_connection_proxy_unittest.cc",
       "../browser/media/router/create_presentation_connection_request_unittest.cc",
       "../browser/media/router/discovery/media_sink_internal_unittest.cc",
+      "../browser/media/router/discovery/media_sink_internal_unittest.h",
       "../browser/media/router/issue_manager_unittest.cc",
       "../browser/media/router/issue_unittest.cc",
       "../browser/media/router/media_route_unittest.cc",
@@ -4448,6 +4449,7 @@ test("unit_tests") {
       sources += [
         "../browser/media/router/discovery/dial/device_description_fetcher_unittest.cc",
         "../browser/media/router/discovery/dial/dial_device_data_unittest.cc",
+        "../browser/media/router/discovery/dial/dial_media_sink_service_unittest.cc",
         "../browser/media/router/discovery/dial/dial_registry_unittest.cc",
         "../browser/media/router/discovery/dial/dial_service_unittest.cc",