[Chromecast] Fix media session blocking tests.

content/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/chromecast_build.gni")
 import("//build/config/compiler/compiler.gni")
 import("//build/config/crypto.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
@@ skipping 45 matching lines @@
     "../public/test/javascript_test_observer.cc",
     "../public/test/javascript_test_observer.h",
     "../public/test/memory_coordinator_test_utils.cc",
     "../public/test/memory_coordinator_test_utils.h",
     "../public/test/mock_blob_url_request_context.cc",
     "../public/test/mock_blob_url_request_context.h",
     "../public/test/mock_download_item.cc",
     "../public/test/mock_download_item.h",
     "../public/test/mock_download_manager.cc",
     "../public/test/mock_download_manager.h",
+    "../public/test/mock_media_session.cc",
+    "../public/test/mock_media_session.h",
     "../public/test/mock_notification_observer.cc",
     "../public/test/mock_notification_observer.h",
     "../public/test/mock_render_process_host.cc",
     "../public/test/mock_render_process_host.h",
     "../public/test/mock_render_thread.cc",
     "../public/test/mock_render_thread.h",
     "../public/test/mock_resource_context.cc",
     "../public/test/mock_resource_context.h",
     "../public/test/mock_special_storage_policy.cc",
     "../public/test/mock_special_storage_policy.h",
@@ skipping 1703 matching lines @@
   if (is_android) {
     deps += [ "//testing/android/native_test:native_test_native_code" ]
   }
 }
 
 group("fuzzers") {
   deps = [
     "//content/test/fuzzer",
   ]
 }