Add Media Router Mojo impl code.

chrome/browser/media/router/BUILD.gn

 # Copyright 2015 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 #
 import("//testing/test.gni")
 import("//third_party/mojo/src/mojo/public/tools/bindings/mojom.gni")
 
 source_set("router") {
   deps = [
     ":router_core",
+    ":keyed_service_factories",
   ]
 }
 
 source_set("router_core") {
   deps = [
     ":mojo_bindings",
     "//base",
     "//components/keyed_service/core",
     "//third_party/mojo/src/mojo/public/cpp/bindings",
     "//url",
   ]
   sources = [
     "create_session_request.cc",
     "create_session_request.h",
     "issue.cc",
     "issue.h",
     "issue_manager.cc",
     "issue_manager.h",
     "issues_observer.h",
     "media_route.cc",
     "media_route.h",
     "media_route_id.h",
     "media_router.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",
     "media_sink.h",
     "media_sinks_observer.cc",
     "media_sinks_observer.h",
     "media_source.cc",
     "media_source.h",
     "media_source_helper.cc",
     "media_source_helper.h",
     "presentation_media_sinks_observer.cc",
     "presentation_media_sinks_observer.h",
     "route_id_manager.cc",
     "route_id_manager.h",
   ]
 }
 
+source_set("keyed_service_factories") {
+  deps = [
+    ":router_core",
+    "//components/keyed_service/content",
+  ]
+  sources = [
+    "media_router_mojo_impl_factory.cc",
+    "media_router_mojo_impl_factory.h",
+  ]
+}
+
 source_set("unit_tests") {
   testonly = true
   deps = [
     ":router_core",
     ":unit_tests_support",
     "//base/test:test_support",
     "//chrome/test:test_support",
     "//testing/gmock",
     "//testing/gtest",
     "//third_party/cld_2:cld2_static",
@@ skipping 32 matching lines @@
 # Optional standalone test binary, for faster isolated builds.
 test("unit_tests_main") {
   deps = [
     ":unit_tests",
     "//testing/gmock:gmock_main",
   ]
   sources = [
     ":unittest_files",
   ]
 }