Use a JS dictionary to initialize a the fields in a Mojo struct

mojo/public/js/bindings/tests/run_js_tests.cc

 // 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.
 
 #include "base/files/file_path.h"
 #include "base/path_service.h"
 #include "gin/modules/console.h"
 #include "gin/modules/module_registry.h"
 #include "gin/modules/timer.h"
 #include "gin/test/file_runner.h"
@@ skipping 34 matching lines @@
 
 // TODO(abarth): Should we autogenerate these stubs from GYP?
 TEST(JSTest, core) {
   RunTest("core_unittests.js", true);
 }
 
 TEST(JSTest, codec) {
   RunTest("codec_unittests.js", true);
 }
 
+TEST(JSTest, struct) {
+  RunTest("struct_unittests.js", true);
+}
+
 TEST(JSTest, validation) {
   RunTest("validation_unittests.js", true);
 }
 
 }  // namespace
 }  // namespace js
 }  // namespace mojo