Add a ScopedPPVar class for helping to track a reference to a base PP_Var.

ppapi/ppapi_shared.gypi

 # Copyright (c) 2012 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.
 
 {
   'variables': {
     'conditions': [
       ['inside_chromium_build==0', {
         'webkit_src_dir': '../../../..',
       },{
@@ skipping 72 matching lines @@
           'shared_impl/ppp_instance_combined.cc',
           'shared_impl/ppp_instance_combined.h',
           'shared_impl/proxy_lock.cc',
           'shared_impl/proxy_lock.h',
           'shared_impl/resource.cc',
           'shared_impl/resource.h',
           'shared_impl/resource_tracker.cc',
           'shared_impl/resource_tracker.h',
           'shared_impl/scoped_pp_resource.cc',
           'shared_impl/scoped_pp_resource.h',
+          'shared_impl/scoped_pp_var.cc',
+          'shared_impl/scoped_pp_var.h',
           'shared_impl/time_conversion.cc',
           'shared_impl/time_conversion.h',
           'shared_impl/tracked_callback.cc',
           'shared_impl/tracked_callback.h',
           'shared_impl/var.cc',
           'shared_impl/var.h',
           'shared_impl/var_tracker.cc',
           'shared_impl/var_tracker.h',
           # TODO(viettrungluu): Split these out; it won't be used in NaCl.
           'shared_impl/private/net_address_private_impl.cc',
@@ skipping 193 matching lines @@
               'thunk/ppb_video_layer_thunk.cc',
               'thunk/ppb_websocket_thunk.cc',
               'thunk/ppb_x509_certificate_private_thunk.cc',
             ],
           }],
         ],
       }],
     ],
   },
 }