[Media Router] Add Media Router Mojo impl code.

chrome/browser/media/router/media_router.gypi

Index: chrome/browser/media/router/media_router.gypi
diff --git a/chrome/browser/media/router/media_router.gypi b/chrome/browser/media/router/media_router.gypi
index 702b04ac4f458ec75d9bf91dfb42369b3af0b59d..44c41eabe25478faa94a04bb6e918c7984c12e7f 100644
--- a/chrome/browser/media/router/media_router.gypi
+++ b/chrome/browser/media/router/media_router.gypi
@@ -17,6 +17,10 @@
       'media_route.h',
       'media_route_id.h',
       'media_router.h',
+      'media_router_mojo_impl.cc',
+      'media_router_mojo_impl.h',
+      'media_router_mojo_impl_factory.cc',
+      'media_router_mojo_impl_factory.h',
       'media_router_type_converters.cc',
       'media_router_type_converters.h',
       'media_routes_observer.cc',
@@ -33,10 +37,14 @@
       'presentation_media_sinks_observer.h',
     ],
     'media_router_test_support_sources': [
+      'media_router_mojo_test.cc',
+      'media_router_mojo_test.h',
       'mock_media_router.cc',
       'mock_media_router.h',
       'mock_screen_availability_listener.cc',
       'mock_screen_availability_listener.h',
+      'test_helper.cc',
+      'test_helper.h',
     ],
   },
 }