Change IDL shim/wrapper generator to use version numbers in struct names.

ppapi/generators/test_gen_pnacl/test_interfaces.idl

 /*
  * 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.
  */
 
 /**
  * This file will test that the pnacl-generated wrapper functions match
  * the comments in this IDL.
  */
@@ skipping 21 matching lines @@
 };
 
 [union, passByValue, returnByValue] struct some_union {
   mem_t X;
   int32_t Y;
 };
 
 /*
  * static __attribute__((pnaclcall)) int32_t
  * Pnacl_M15_PPB_Iface_struct_wrap_foo1(int32_t a, struct some_struct b) {
- *   const struct PPB_Iface_struct_wrap *iface =
- *     Pnacl_WrapperInfo_PPB_Iface_struct_wrap.real_iface;
+ *   const struct PPB_Iface_struct_wrap_2_0 *iface =
+ *     Pnacl_WrapperInfo_PPB_Iface_struct_wrap_2_0.real_iface;
  *   return iface->foo1(a, b);
  * }
  */
 [version=2.0]
 interface PPB_Iface_struct_wrap {
   int32_t foo1(int32_t a, [in] some_struct b);
 };
 
 /*
  * static __attribute__((pnaclcall)) int32_t
  * Pnacl_M15_PPB_Iface_union_wrap_foo1(int32_t a, union some_union b) {
- *   const struct PPB_Iface_union_wrap *iface =
- *     Pnacl_WrapperInfo_PPB_Iface_union_wrap.real_iface;
+ *   const struct PPB_Iface_union_wrap_2_0 *iface =
+ *     Pnacl_WrapperInfo_PPB_Iface_union_wrap_2_0.real_iface;
  *   return iface->foo1(a, b);
  * }
  */
 [version=2.0]
 interface PPB_Iface_union_wrap {
   int32_t foo1(int32_t a, [in] some_union b);
 };
 
 
 [version=2.0]
@@ skipping 74 matching lines @@
 
   [version=1.0]
   int32_t foo1([in] some_struct[] a);
 
   /* Not generating wrapper interface for PPP_SomeWrap */
   [version=2.0]
   int32_t foo1([in] some_struct2 a);
   [version=2.0]
   void foo2([in] int32_t a);
 };