PPAPI: Refactor MessageChannel to prep for sync postMessae

components/nacl/renderer/nacl_helper.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 "components/nacl/renderer/nacl_helper.h"
+
+#include "content/public/renderer/renderer_ppapi_host.h"
+
+NaClHelper::NaClHelper(content::RenderFrame* render_frame)
+    : RenderFrameObserver(render_frame) {}
+
+NaClHelper::~NaClHelper() {}
+
+void NaClHelper::DidCreatePepperPlugin(content::RendererPpapiHost* host) {
+  // The Native Client plugin is a host for external plugins.
+  if (host->GetPluginName() == "Native Client")
+    host->SetToExternalPluginHost();
+}