Add failure case for manifest file testing.

chrome/test/data/nacl/nacl_test_data.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.
 
 {
   'includes': [
     '../../../../ppapi/ppapi_nacl_test_common.gypi',
   ],
   'targets': [
     {
@@ skipping 626 matching lines @@
           '-limc_syscalls',
           '-lweak_ref',
           '-lnacl',
         ],
         'sources': [
           'manifest_file/irt_manifest_file_test.cc',
         ],
         'create_nmf_args_portable': [
           '-xtest_file:test_file.txt',
           '-xnmf says hello world:test_file.txt',
+          # There is no dummy_test_file.txt file intentionally. This is just for
+          # a test case where there is a manifest entry, but no actual file.
+          '-xdummy_test_file:dummy_test_file.txt',
         ],
         'test_files': [
           'manifest_file/irt_manifest_file_test.html',
         ],
       },
       'dependencies': [
         '<(DEPTH)/native_client/tools.gyp:prep_toolchain',
         '<(DEPTH)/ppapi/ppapi_nacl.gyp:ppapi_cpp_lib',
         '<(DEPTH)/ppapi/native_client/native_client.gyp:ppapi_lib',
         '<(DEPTH)/native_client/src/shared/srpc/srpc.gyp:srpc_lib',
@@ skipping 548 matching lines @@
               'files': [
                 '>@(test_files)',
               ],
             },
           ],
         },
       ],
     }],
   ],
 }