PPAPI: Initialize CompletionCallbackWithOutput storage

ppapi/cpp/private/pass_file_handle.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_PASS_FILE_HANDLE_H_
 #define PPAPI_CPP_PRIVATE_PASS_FILE_HANDLE_H_
 
+#include <string.h>
+
 #include "ppapi/c/private/pp_file_handle.h"
 #include "ppapi/cpp/output_traits.h"
 
 namespace pp {
 
 // A wrapper class for PP_FileHandle to make sure a file handle is
 // closed. This object takes the ownership of the file handle when it
 // is constructed. This loses the ownership when this object is
 // assigned to another object, just like auto_ptr.
 class PassFileHandle {
@@ skipping 42 matching lines @@
   typedef PP_FileHandle* APIArgType;
   typedef PP_FileHandle StorageType;
 
   static inline APIArgType StorageToAPIArg(StorageType& t) {
     return &t;
   }
 
   static inline PassFileHandle StorageToPluginArg(StorageType& t) {
     return PassFileHandle(t);
   }
+
+  static inline void Initialize(StorageType* t) {
+    memset(t, 0, sizeof(*t));
+  }
 };
 
 }  // namespace internal
 }  // namespace pp
 
 #endif  // PPAPI_CPP_PRIVATE_PASS_FILE_HANDLE_H_