Proxy PPB_Var, fix o-o-p string var id tracking.

ppapi/ppapi_proxy.gypi

 # 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.
 
 {
   'targets': [
     {
       'target_name': 'ppapi_proxy',
       'type': 'static_library',
       'dependencies': [
@@ skipping 104 matching lines @@
         'proxy/ppb_url_loader_proxy.cc',
         'proxy/ppb_url_loader_proxy.h',
         'proxy/ppb_url_request_info_proxy.cc',
         'proxy/ppb_url_request_info_proxy.h',
         'proxy/ppb_url_response_info_proxy.cc',
         'proxy/ppb_url_response_info_proxy.h',
         'proxy/ppb_url_util_proxy.cc',
         'proxy/ppb_url_util_proxy.h',
         'proxy/ppb_var_deprecated_proxy.cc',
         'proxy/ppb_var_deprecated_proxy.h',
+        'proxy/ppb_var_proxy.cc',
+        'proxy/ppb_var_proxy.h',
         'proxy/ppp_class_proxy.cc',
         'proxy/ppp_class_proxy.h',
         'proxy/ppp_graphics_3d_proxy.cc',
         'proxy/ppp_graphics_3d_proxy.h',
         'proxy/ppp_instance_private_proxy.cc',
         'proxy/ppp_instance_private_proxy.h',
         'proxy/ppp_instance_proxy.cc',
         'proxy/ppp_instance_proxy.h',
         'proxy/proxy_channel.cc',
         'proxy/proxy_channel.h',
@@ skipping 15 matching lines @@
         ['OS=="win"', {
         }],
         ['OS=="linux"', {
         }],
         ['OS=="mac"', {
         }]
       ],
     },
   ],
 }