Convert the async device ID getter to a chrome resource host

ppapi/proxy/flash_device_id_resource.h

+// Copyright (c) 2012 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.
+
+#ifndef PPAPI_PROXY_FLASH_DEVICE_ID_RESOURCE_H_
+#define PPAPI_PROXY_FLASH_DEVICE_ID_RESOURCE_H_
+
+#include "ppapi/proxy/plugin_resource.h"
+#include "ppapi/proxy/ppapi_proxy_export.h"
+#include "ppapi/shared_impl/tracked_callback.h"
+#include "ppapi/thunk/ppb_flash_device_id_api.h"
+
+namespace ppapi {
+namespace proxy {
+
+class FlashDeviceIDResource
+    : public PluginResource,
+      public thunk::PPB_Flash_DeviceID_API {
+ public:
+  FlashDeviceIDResource(Connection connection,
+                        PP_Instance instance);
+  virtual ~FlashDeviceIDResource();
+
+  // Resource override.
+  virtual thunk::PPB_Flash_DeviceID_API* AsPPB_Flash_DeviceID_API() OVERRIDE;
+
+  // PPB_Flash_DeviceID_API implementation.
+  virtual int32_t GetDeviceID(PP_Var* id,
+                              scoped_refptr<TrackedCallback> callback) OVERRIDE;
+
+ private:
+  // PluginResource override;
+  virtual void OnReplyReceived(const ResourceMessageReplyParams& params,
+                               const IPC::Message& msg);
+
+  // IPC message handler.
+  void OnPluginMsgGetDeviceIDReply(const ResourceMessageReplyParams& params,
+                                   const std::string& id);
+
+  // Non-null when a callback is pending.
+  PP_Var* dest_;
+
+  scoped_refptr<TrackedCallback> callback_;
+
+  DISALLOW_COPY_AND_ASSIGN(FlashDeviceIDResource);
+};
+
+}  // namespace proxy
+}  // namespace ppapi
+
+#endif  // PPAPI_PROXY_FLASH_DEVICE_ID_RESOURCE_H_