Implement Asynchronous Module Definition API for Mojo

gin/context_holder.cc

+// 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.
+
+#include "gin/context_holder.h"
+
+#include <assert.h>
+#include "gin/per_context_data.h"
+
+namespace gin {
+
+ContextHolder::ContextHolder(v8::Isolate* isolate)
+    : isolate_(isolate) {
+}
+
+ContextHolder::~ContextHolder() {
+  v8::HandleScope handle_scope(isolate());
+  v8::Handle<v8::Context> context = this->context();
+
+  PerContextData* data = PerContextData::From(context);
+  data->Detach(context);
+  delete data;
+
+  // TODO(abarth): Figure out how to set kResetInDestructor to true.
+  context_.Reset();
+}
+
+void ContextHolder::SetContext(v8::Handle<v8::Context> context) {
+  assert(context_.IsEmpty());
+  context_.Reset(isolate_, context);
+  new PerContextData(context);  // Deleted in ~ContextHolder.
+}
+
+}  // namespace gin