Show Media Router toolbar icon ephemerally for MR dialogs

chrome/test/BUILD.gn

 # Copyright 2014 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("//build/config/chrome_build.gni")
 import("//build/config/compiler/compiler.gni")
 import("//build/config/crypto.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//chrome/common/features.gni")
@@ skipping 4292 matching lines @@
         "../browser/media/router/media_router_ui_service_factory_unittest.cc",
         "../browser/media/router/mojo/media_router_mojo_impl_unittest.cc",
         "../browser/media/router/mojo/media_router_mojo_metrics_unittest.cc",
         "../browser/media/router/mojo/media_router_type_converters_unittest.cc",
         "../browser/ui/toolbar/media_router_action_controller_unittest.cc",
         "../browser/ui/toolbar/media_router_action_unittest.cc",
         "../browser/ui/toolbar/media_router_contextual_menu_unittest.cc",
         "../browser/ui/webui/media_router/cast_modes_with_media_sources_unittest.cc",
         "../browser/ui/webui/media_router/media_cast_mode_unittest.cc",
         "../browser/ui/webui/media_router/media_router_dialog_controller_impl_unittest.cc",
-        "../browser/ui/webui/media_router/media_router_test.cc",
-        "../browser/ui/webui/media_router/media_router_test.h",
         "../browser/ui/webui/media_router/media_router_ui_unittest.cc",
+        "../browser/ui/webui/media_router/media_router_web_ui_test.cc",
+        "../browser/ui/webui/media_router/media_router_web_ui_test.h",
         "../browser/ui/webui/media_router/media_router_webui_message_handler_unittest.cc",
         "../browser/ui/webui/media_router/query_result_manager_unittest.cc",
       ]
     }
   }
   if (enable_captive_portal_detection) {
     sources += [
       "../browser/captive_portal/captive_portal_service_unittest.cc",
       "../browser/captive_portal/captive_portal_tab_helper_unittest.cc",
       "../browser/captive_portal/captive_portal_tab_reloader_unittest.cc",
@@ skipping 709 matching lines @@
       "touch_hud",
       "ui",
     ]
 
     if (is_linux && !is_android) {
       deps += [ "//components/font_service:manifest" ]
       packaged_services += [ "font_service" ]
     }
   }
 }