Proxy PPB_ArrayBuffer_Dev, make them work over Messaging

ppapi/native_client/src/shared/ppapi_proxy/plugin_ppb_var.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.
 
 #ifndef NATIVE_CLIENT_SRC_SHARED_PPAPI_PROXY_PLUGIN_VAR_H_
 #define NATIVE_CLIENT_SRC_SHARED_PPAPI_PROXY_PLUGIN_VAR_H_
 
 #include <string>
 
 #include "native_client/src/include/nacl_macros.h"
 #include "native_client/src/include/portability.h"
+#include "ppapi/c/dev/ppb_var_array_buffer_dev.h"
 #include "ppapi/c/pp_var.h"
 #include "ppapi/c/ppb_var.h"
 
 namespace ppapi_proxy {
 
 // Implements the plugin side of the PPB_Var interface.
 // This implementation also determines how PP_Vars are represented internally
 // in the proxied implementation.
 class PluginVar {
  public:
   // Returns an interface pointer suitable to the PPAPI client.
   static const PPB_Var* GetInterface();
   // Returns the 1.0 interface to support backwards-compatibility.
   static const PPB_Var_1_0* GetInterface1_0();
 
+  // Returns an interface pointer for the PPB_VarArrayBuffer_Dev interface.
+  static const PPB_VarArrayBuffer_Dev* GetArrayBufferInterface();
+
   // String helpers.
   static PP_Var StringToPPVar(const std::string& str);
   static std::string PPVarToString(const PP_Var& var);
 
   // Printing and debugging.
   static void Print(const PP_Var& var);
   static std::string DebugString(const PP_Var& var);
 
  private:
   NACL_DISALLOW_COPY_AND_ASSIGN(PluginVar);
 };
 
 }  // namespace ppapi_proxy
 
 #endif  // NATIVE_CLIENT_SRC_SHARED_PPAPI_PROXY_PLUGIN_VAR_H_