Adds QueryResultManager support class for Media Router Dialog WebUI

chrome/chrome_tests_unit.gypi

Index: chrome/chrome_tests_unit.gypi
diff --git a/chrome/chrome_tests_unit.gypi b/chrome/chrome_tests_unit.gypi
index 47d96dc7d7d22d879a95abc7fa93c86b298aa49f..3f7c8bd3fae576a04287566414fc2c806c2658eb 100644
--- a/chrome/chrome_tests_unit.gypi
+++ b/chrome/chrome_tests_unit.gypi
@@ -1518,6 +1518,7 @@
       'browser/ui/website_settings/permission_menu_model_unittest.cc',
       'browser/ui/webui/help/version_updater_chromeos_unittest.cc',
       'browser/ui/webui/media_router/media_cast_mode_unittest.cc',
+      'browser/ui/webui/media_router/query_result_manager_unittest.cc',
       'browser/ui/webui/ntp/ntp_user_data_logger_unittest.cc',
       'browser/ui/webui/ntp/suggestions_combiner_unittest.cc',
       'browser/ui/webui/options/autofill_options_handler_unittest.cc',
@@ -2062,6 +2063,17 @@
         'browser/sync/glue/session_sync_test_helper.h',
         'test/base/run_all_unittests.cc',
       ],
+      'conditions': [
+        ['enable_media_router==1', {
+          'sources' : [
+            'browser/media/router/mock_media_router.cc',
+            'browser/media/router/mock_media_router.h',
+          ],
+          'dependencies': [
+            'browser/media/router/media_router.gyp:media_router',
+          ],
+        }],         
+      ],
     },
     {
       # GN version: //chrome/test:unit_tests