New thunk system for Pepper proxy and implementation

ppapi/thunk/ppb_image_data_api.h

+// Copyright (c) 2011 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 "ppapi/c/pp_bool.h"
+#include "ppapi/c/ppb_image_data.h"
+#include "ppapi/c/pp_point.h"
+#include "ppapi/c/pp_resource.h"
+
+namespace ppapi {
+namespace thunk {
+
+class PPB_ImageData_API {
+ public:
+  virtual PP_Bool Describe(PP_ImageDataDesc* desc) = 0;
+  virtual void* Map() = 0;
+  virtual void Unmap() = 0;
+};
+
+}  // namespace thunk
+}  // namespace ppapi