[Media Router] 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 62caec66e47829332c000cc87c530e1c6386dff7..31cf3ed1affaedf3f688f0e233adee7dd5d50aac 100644
--- a/chrome/browser/media/router/BUILD.gn
+++ b/chrome/browser/media/router/BUILD.gn
@@ -11,14 +11,16 @@ gypi_values = exec_script("//build/gypi_to_gn.py",
                           [ "media_router.gypi" ])
 
 # TODO(mfoltz): Fix problem that requires explicitly listing //skia
-source_set("router") {
+static_library("router") {
   deps = [
     ":mojo_bindings",
     "//base",
-    "//extensions/browser",
+    "//chrome/common:constants",
+    "//components/keyed_service/content",
     "//components/keyed_service/core",
-    "//third_party/mojo/src/mojo/public/cpp/bindings",
+    "//extensions/browser",
     "//skia",
+    "//third_party/mojo/src/mojo/public/cpp/bindings",
     "//url",
   ]
   sources = rebase_path(gypi_values.media_router_sources,