PPAPI: Initialize CompletionCallbackWithOutput storage

ppapi/cpp/private/video_frame_private.h

 // Copyright (c) 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.
 
 #ifndef PPAPI_CPP_PRIVATE_VIDEO_FRAME_PRIVATE_H_
 #define PPAPI_CPP_PRIVATE_VIDEO_FRAME_PRIVATE_H_
 
+#include <string.h>
+
 #include "ppapi/c/pp_time.h"
 #include "ppapi/c/private/pp_video_frame_private.h"
 #include "ppapi/cpp/completion_callback.h"
 #include "ppapi/cpp/image_data.h"
 #include "ppapi/cpp/pass_ref.h"
 
 /// @file
 /// This file defines the struct used to hold a video frame.
 
 namespace pp {
@@ skipping 62 matching lines @@
   typedef PP_VideoFrame_Private* APIArgType;
   typedef PP_VideoFrame_Private StorageType;
 
   static inline APIArgType StorageToAPIArg(StorageType& t) {
     return &t;
   }
 
   static inline pp::VideoFrame_Private StorageToPluginArg(StorageType& t) {
     return pp::VideoFrame_Private(PASS_REF, t);
   }
+
+  static inline void Initialize(StorageType* t) {
+    VideoFrame_Private dummy;
+    *t = dummy.pp_video_frame();
+  }
 };
 
 }  // namespace internal
 
 }  // namespace pp
 
 #endif  // PPAPI_CPP_PRIVATE_VIDEO_FRAME_PRIVATE_H_