gin: Create a DataObjectBuilder class to help create simple data objects.

gin/data_object_builder.cc

Index: gin/data_object_builder.cc
diff --git a/gin/data_object_builder.cc b/gin/data_object_builder.cc
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index 0000000000000000000000000000000000000000..243c7efc5ff60fde3d2eb2899fa99be70e02189a
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+++ b/gin/data_object_builder.cc
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+// Copyright 2017 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 "gin/data_object_builder.h"
+
+namespace gin {
+
+DataObjectBuilder::DataObjectBuilder(v8::Isolate* isolate)
+    : isolate_(isolate),
+      context_(isolate->GetCurrentContext()),
+      object_(v8::Object::New(isolate)) {}
+
+}  // namespace gin