Introduce PPB_Flash_MessageLoop interface for Pepper Flash.

ppapi/thunk/ppb_flash_message_loop_api.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_THUNK_PPB_FLASH_MESSAGE_LOOP_API_H_
+#define PPAPI_THUNK_PPB_FLASH_MESSAGE_LOOP_API_H_
+
+#include "base/callback_forward.h"
+#include "ppapi/c/private/ppb_flash_message_loop.h"
+
+namespace ppapi {
+namespace thunk {
+
+class PPB_Flash_MessageLoop_API {
+ public:
+  virtual ~PPB_Flash_MessageLoop_API() {}
+
+  virtual int32_t Run() = 0;
+  virtual void Quit() = 0;
+
+  // This is used by the proxy at the host side to call into the implementation.
+  // |callback| is called when the message loop is signaled to quit but before
+  // the method returns.
+  typedef base::Callback<void (int32_t)> RunFromHostProxyCallback;
+  virtual void RunFromHostProxy(
+      const RunFromHostProxyCallback& callback) = 0;
+};
+
+}  // namespace thunk
+}  // namespace ppapi
+
+#endif  // PPAPI_THUNK_PPB_FLASH_MESSAGE_LOOP_API_H_