Extract ResultCatcher from ExtensionApiTest. Use it in ShellApiTest.

extensions/shell/app_shell.gyp

 # 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.
 
 {
   'variables': {
     'chromium_code': 1,
   },
   'targets': [
     {
@@ skipping 163 matching lines @@
       ],
       'sources': [
         # TODO(yoz): Refactor once we have a second test target.
         # TODO(yoz): Something is off here; should this .gyp file be
         # in the parent directory? Test target extensions_browsertests?
         '../browser/api/dns/dns_apitest.cc',
         '../browser/api/socket/socket_apitest.cc',
         '../browser/api/sockets_tcp/sockets_tcp_apitest.cc',
         '../browser/api/sockets_udp/sockets_udp_apitest.cc',
         'browser/shell_browsertest.cc',
+        'test/shell_apitest.cc',
+        'test/shell_apitest.h',
+        'test/shell_test.cc',
         'test/shell_test.h',
-        'test/shell_test.cc',
         'test/shell_test_launcher_delegate.cc',
         'test/shell_test_launcher_delegate.h',
         'test/shell_tests_main.cc',
       ],
     },
     {
       'target_name': 'app_shell_unittests',
       'type': 'executable',
       'dependencies': [
         'app_shell_lib',
@@ skipping 57 matching lines @@
             '<@(_outputs)',
           ],
           'includes': [
             '../../build/util/version.gypi',
           ],
         },
       ],
     },
   ],  # targets
 }