Add a default constructor for VarArrayBuffer, so that it can be used by ext::DictField.

ppapi/cpp/extensions/dev/socket_dev.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_DEV_SOCKET_DEV_H_
 #define PPAPI_CPP_EXTENSIONS_DEV_SOCKET_DEV_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 78 matching lines @@
   ~ReadInfo_Dev();
 
   bool Populate(const PP_Ext_Socket_ReadInfo_Dev& value);
 
   Var CreateVar() const;
 
   static const char* const kResultCode;
   static const char* const kData;
 
   DictField<int32_t> result_code;
-  // TODO(yzshen): It is more natural to use VarArrayBuffer, but it doesn't have
-  // a default constructor currently.
-  DictField<Var> data;
+  DictField<VarArrayBuffer> data;
 };
 
 class WriteInfo_Dev : public internal::OutputObjectBase {
  public:
   WriteInfo_Dev();
   ~WriteInfo_Dev();
 
   bool Populate(const PP_Ext_Socket_WriteInfo_Dev& value);
 
   Var CreateVar() const;
@@ skipping 11 matching lines @@
   bool Populate(const PP_Ext_Socket_RecvFromInfo_Dev& value);
 
   Var CreateVar() const;
 
   static const char* const kResultCode;
   static const char* const kData;
   static const char* const kAddress;
   static const char* const kPort;
 
   DictField<int32_t> result_code;
-  DictField<Var> data;
+  DictField<VarArrayBuffer> data;
   DictField<std::string> address;
   DictField<int32_t> port;
 };
 
 class SocketInfo_Dev : public internal::OutputObjectBase {
  public:
   SocketInfo_Dev();
   ~SocketInfo_Dev();
 
   bool Populate(const PP_Ext_Socket_SocketInfo_Dev& value);
@@ skipping 48 matching lines @@
   //                const CompletionCallbackWithOutput<int32_t>& callback);
   //int32_t Bind(int32_t socket_id,
   //             const std::string& address,
   //             int32_t port,
   //             const CompletionCallbackWithOutput<int32_t>& callback);
   void Disconnect(int32_t socket_id);
   int32_t Read(int32_t socket_id,
                const Optional<int32_t>& buffer_size,
                const CompletionCallbackWithOutput<ReadInfo_Dev>& callback);
   int32_t Write(int32_t socket_id,
-                const Var& data,
+                const VarArrayBuffer& data,
                 const CompletionCallbackWithOutput<WriteInfo_Dev>& callback);
   int32_t RecvFrom(
       int32_t socket_id,
       const Optional<int32_t>& buffer_size,
       const CompletionCallbackWithOutput<RecvFromInfo_Dev>& callback);
   int32_t SendTo(int32_t socket_id,
-                 const Var& data,
+                 const VarArrayBuffer& data,
                  const std::string& address,
                  int32_t port,
                  const CompletionCallbackWithOutput<WriteInfo_Dev>& callback);
   // TODO(yzshen): Support more powerful traits.
   //int32_t Listen(int32_t socket_id,
   //               const std::string& address,
   //               int32_t port,
   //               const Optional<int32_t>& backlog,
   //               const CompletionCallbackWithOutput<int32_t>& callback);
   int32_t Accept(int32_t socket_id,
@@ skipping 14 matching lines @@
 
  private:
   InstanceHandle instance_;
 };
 
 }  // namespace socket
 }  // namespace ext
 }  // namespace pp
 
 #endif  // PPAPI_CPP_EXTENSIONS_DEV_SOCKET_DEV_H_