Add Media Router Mojo impl code.

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 55819d7cb4d5788e90c20550655fedc7551782b6..c06246bc8aac57de28ea1739468bd2b9f7991f97 100644
--- a/chrome/browser/media/router/BUILD.gn
+++ b/chrome/browser/media/router/BUILD.gn
@@ -14,6 +14,7 @@ source_set("router") {
 
 source_set("router_core") {
   deps = [
+    ":mojo_bindings",
     "//base",
     "//components/keyed_service/core",
     "//url",
@@ -30,6 +31,10 @@ source_set("router_core") {
     "media_router.h",
     "media_router_impl.cc",
     "media_router_impl.h",
+    "media_router_mojo_impl.cc",
+    "media_router_mojo_impl.h",
+    "media_router_type_converters.cc",
+    "media_router_type_converters.h",
     "media_routes_observer.cc",
     "media_routes_observer.h",
     "media_sink.cc",
@@ -53,6 +58,8 @@ source_set("keyed_service_factories") {
   sources = [
     "media_router_impl_factory.cc",
     "media_router_impl_factory.h",
+    "media_router_mojo_impl_factory.cc",
+    "media_router_mojo_impl_factory.h",
   ]
 }