Add GN interactive UI tests.

extensions/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("//tools/grit/grit_rule.gni")
 import("//tools/grit/repack.gni")
 
 assert(enable_extensions)
 
 # GYP version: extensions/extensions_resources.gyp:extensions_resources
@@ skipping 76 matching lines @@
     "common/manifest_test.cc",
     "common/manifest_test.h",
     "common/test_util.cc",
     "common/test_util.h",
     "common/value_builder.cc",
     "common/value_builder.h",
     "renderer/test_extensions_renderer_client.cc",
     "renderer/test_extensions_renderer_client.h",
     "test/extension_test_message_listener.cc",
     "test/extension_test_message_listener.h",
+    "test/result_catcher.cc",
+    "test/result_catcher.h",
     "test/test_extensions_client.cc",
     "test/test_extensions_client.h",
     "test/test_permission_message_provider.cc",
     "test/test_permission_message_provider.h",
     "test/test_service_registration_manager.cc",
     "test/test_service_registration_manager.h",
   ]
 
   deps = [
     ":extensions_resources",
@@ skipping 162 matching lines @@
       "//testing/gmock",
       "//testing/gtest",
       "//third_party/leveldatabase",
     ]
 
     if (is_win) {
       deps += [ "//base/allocator" ]
     }
   }
 }