Proxy PPB_ArrayBuffer_Dev, make them work over Messaging

ppapi/native_client/src/shared/ppapi_proxy/plugin_ppb_var.h

Index: ppapi/native_client/src/shared/ppapi_proxy/plugin_ppb_var.h
diff --git a/ppapi/native_client/src/shared/ppapi_proxy/plugin_ppb_var.h b/ppapi/native_client/src/shared/ppapi_proxy/plugin_ppb_var.h
index 3f6094607d80d1c85cedcb181bb97cee9d1ffca7..1083e792577cce3b1abc101174dc1a1ee4e31b55 100644
--- a/ppapi/native_client/src/shared/ppapi_proxy/plugin_ppb_var.h
+++ b/ppapi/native_client/src/shared/ppapi_proxy/plugin_ppb_var.h
@@ -9,6 +9,7 @@
 
 #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"
 
@@ -24,6 +25,9 @@ class PluginVar {
   // 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);