PPAPI/NaCl: Make NaClIPCAdapter transfer handles more generally

gpu/gpu_untrusted.gyp

 # 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': {
     'chromium_code': 1,
+    # nacl_target is for building the Win64 NaCl broker.
+    'nacl_target': 0,
   },
   'includes': [
     '../native_client/build/untrusted.gypi',
     'gpu_common.gypi',
   ],
   'conditions': [
     ['disable_nacl==0 and disable_nacl_untrusted==0', {
       'targets': [
         {
           'target_name': 'gles2_implementation_untrusted',
@@ skipping 89 matching lines @@
           'dependencies': [
             '../native_client/tools.gyp:prep_toolchain',
             '../base/base_untrusted.gyp:base_untrusted',
             'command_buffer_common_untrusted',
           ],
         },
       ],
     }],
   ],
 }