Add ExtensionsTestBrowserContext class for test.

extensions/extensions.gyp

 # Copyright 2013 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 643 matching lines @@
       ],
       'sources': [
         'browser/test_extensions_browser_client.cc',
         'browser/test_extensions_browser_client.h',
         'browser/test_management_policy.cc',
         'browser/test_management_policy.h',
         'browser/test_runtime_api_delegate.cc',
         'browser/test_runtime_api_delegate.h',
         'common/extension_builder.cc',
         'common/extension_builder.h',
+        'common/extensions_test_browser_context.cc',
+        'common/extensions_test_browser_context.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',
       ],
       # Disable c4267 warnings until we fix size_t to int truncations.
       'msvs_disabled_warnings': [ 4267, ],
     },
@@ skipping 28 matching lines @@
         'test/test_extensions_client.cc',
         'test/test_extensions_client.h',
         'test/test_permission_message_provider.cc',
         'test/test_permission_message_provider.h',
         'test/test_permissions_provider.cc',
         'test/test_permissions_provider.h',
       ],
     },
   ]
 }