Add an app_shell_unittests target

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")
 
 # GYP version: extensions/extensions_resources.gyp:extensions_resources
 group("extensions_resources") {
   deps = [
@@ skipping 43 matching lines @@
     "browser/test_runtime_api_delegate.cc",
     "browser/test_runtime_api_delegate.h",
     "common/extension_builder.cc",
     "common/extension_builder.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/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",
+   ]
 
   deps = [
+    ":extensions_resources",
     "//base",
     "//extensions/browser",
     "//extensions/common",
     "//extensions/common/api",
     "//net:test_support",
     "//testing/gmock",
     "//testing/gtest",
   ]
 
   if (is_win) {
@@ skipping 71 matching lines @@
     "renderer/event_unittest.cc",
     "renderer/json_schema_unittest.cc",
     "renderer/messaging_utils_unittest.cc",
     "renderer/module_system_test.cc",
     "renderer/module_system_test.h",
     "renderer/module_system_unittest.cc",
     "renderer/safe_builtins_unittest.cc",
     "renderer/script_context_set_unittest.cc",
     "renderer/utils_unittest.cc",
     "test/extensions_unittests_main.cc",
-    "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",
-  ]
+ ]
 
   deps = [
     ":extensions_resources",
     ":shell_and_test_pak",
     ":test_support",
     "//base",
     "//base/test:test_support",
     "//content/test:test_support",
     "//device/serial",
     "//device/serial:test_util",
     "//extensions/common",
     "//extensions/renderer",
     "//extensions/strings",
     "//mojo/environment:chromium",
     "//mojo/public/cpp/bindings",
     "//mojo/bindings/js",
     "//mojo/system",
     "//testing/gmock",
     "//testing/gtest",
   ]
 
   if (is_win) {
     deps += [
       "//base/allocator",
     ]
   }
 }
 }