PPAPI: Initialize CompletionCallbackWithOutput storage

ppapi/cpp/extensions/ext_output_traits.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_EXTENSIONS_OUTPUT_TRAITS_H_
 #define PPAPI_CPP_EXTENSIONS_OUTPUT_TRAITS_H_
 
 #include <vector>
 
 #include "ppapi/c/pp_var.h"
@@ skipping 50 matching lines @@
 
   static inline APIArgType StorageToAPIArg(StorageType& t) {
     return &t.pp_var();
   }
 
   // This must be called exactly once to consume the one PP_Var reference
   // assigned to us by the browser.
   static inline T& StorageToPluginArg(StorageType& t) {
     return t.output();
   }
+
+  static inline void Initialize(StorageType* /* t */) {}
 };
 
 // This class provides storage for a PP_Var and a vector of objects which are
 // of type T. The PP_Var is used as an output parameter to receive an array var
 // from the browser. Each element in the array var is converted to a T object,
 // using FromVarConverter, and stores in the vector.
 template <class T>
 class ArrayVarOutputAdapterWithStorage {
  public:
   ArrayVarOutputAdapterWithStorage() : pp_var_(PP_MakeUndefined()) {
@@ skipping 41 matching lines @@
 
   static inline APIArgType StorageToAPIArg(StorageType& t) {
     return &t.pp_var();
   }
 
   // This must be called exactly once to consume the one PP_Var reference
   // assigned to us by the browser.
   static inline std::vector<T>& StorageToPluginArg(StorageType& t) {
     return t.output();
   }
+
+  static inline void Initialize(StorageType* /* t */) {}
 };
 
 }  // namespace internal
 }  // namespace ext
 }  // namespace pp
 
 #endif  // PPAPI_CPP_EXTENSIONS_OUTPUT_TRAITS_H_