[iOS/OSX] Refactor mac_framework so that it can be shared with iOS.

testing/test.gni

 # Copyright 2015 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.
 
 # ==============================================================================
 # TEST SETUP
 # ==============================================================================
 
 # Define a test as an executable (or apk on Android) with the "testonly" flag
 # set.
@@ skipping 160 matching lines @@
         ":${_test_target}_generate_executable",
       ]
       sources = [
         "//testing/gtest_ios/Default.png",
       ]
       outputs = [
         "{{bundle_resources_dir}}/{{source_file_part}}",
       ]
     }
 
-    app(_test_target) {
+    ios_app_bundle(_test_target) {
       # TODO(GYP): Make this configurable and only provide a default
       # that can be overridden.
       info_plist = "//testing/gtest_ios/unittest-Info.plist"
       app_name = target_name
       entitlements_path = "//testing/gtest_ios"
       code_signing_identity = ""
       testonly = true
       extra_substitutions = [ "BUNDLE_ID_TEST_NAME=$app_name" ]
 
       # See above call.
@@ skipping 31 matching lines @@
     # TODO(GYP): Delete this after we've converted everything to GN.
     # The _run targets exist only for compatibility with GYP.
     group("${target_name}_run") {
       testonly = true
       deps = [
         ":${invoker.target_name}",
       ]
     }
   }
 }