Fix FMCallExpression undefined shift behaviour.

pdfium.gyp

 # Copyright 2015 PDFium 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,
     'pdf_use_skia%': 0,
     'pdf_enable_v8%': 1,
     'pdf_enable_xfa%': 0, # Set to 1 by standalone.gypi in a standalone build.
@@ skipping 931 matching lines @@
         'testing/fx_string_testhelpers.h',
         'testing/fx_string_testhelpers.cpp',
       ],
       'conditions': [
         ['pdf_enable_xfa==1', {
           'sources': [
             'xfa/fde/css/fde_cssdatatable.cpp',
             'xfa/fde/xml/fde_xml_imp_unittest.cpp',
             'xfa/fxbarcode/pdf417/BC_PDF417HighLevelEncoder_unittest.cpp',
             'xfa/fxfa/app/xfa_textlayout_unittest.cpp',
+            'xfa/fxfa/fm2js/xfa_simpleexpression_unittest.cpp',
             'xfa/fxfa/parser/xfa_utils_unittest.cpp',
           ],
         }],
         ['pdf_use_skia==1', {
           'sources': [
             'core/fxge/skia/fx_skia_device_unittest.cpp',
           ],
         }],
         ['pdf_enable_v8==1', {
           'include_dirs': [
@@ skipping 155 matching lines @@
             'fpdfsdk/fpdfxfa/include/fpdfxfa_app.h',
             'fpdfsdk/fpdfxfa/include/fpdfxfa_doc.h',
             'fpdfsdk/fpdfxfa/include/fpdfxfa_page.h',
             'fpdfsdk/fpdfxfa/include/fpdfxfa_util.h',
           ],
         },
       ]
     }],
   ]
 }