Set up NaClChromeMainArgs number_of_cores member so apps can size threadpools appropriately

ppapi/native_client/chrome_main.scons

 #! -*- python -*-
 # Copyright (c) 2012 The Native Client Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import json
 import os
 import shutil
 import sys
 
@@ skipping 22 matching lines @@
 ppapi_scons_files = {}
 ppapi_scons_files['trusted_scons_files'] = []
 ppapi_scons_files['untrusted_irt_scons_files'] = []
 
 ppapi_scons_files['nonvariant_test_scons_files'] = [
     'tests/breakpad_crash_test/nacl.scons',
     'tests/nacl_browser/browser_dynamic_library/nacl.scons',
     'tests/nacl_browser/manifest_file/nacl.scons',
     'tests/nacl_browser/nameservice/nacl.scons',
     'tests/nacl_browser/postmessage_redir/nacl.scons',
+    'tests/nacl_browser/sysconf_nprocessors/nacl.scons',
     'tests/ppapi_browser/bad/nacl.scons',
     'tests/ppapi_browser/crash/nacl.scons',
     'tests/ppapi_browser/extension_mime_handler/nacl.scons',
     'tests/ppapi_browser/manifest/nacl.scons',
     'tests/ppapi_browser/ppb_instance/nacl.scons',
     'tests/ppapi_browser/ppp_instance/nacl.scons',
     'tests/ppapi_test_lib/nacl.scons',
 ]
 
 ppapi_scons_files['irt_variant_test_scons_files'] = [
@@ skipping 575 matching lines @@
 
 pre_base_env.AddMethod(PPAPIGraphics3DIsBroken)
 
 
 def AddChromeFilesFromGroup(env, file_group):
   env['BUILD_SCONSCRIPTS'] = ExtendFileList(
       env.get('BUILD_SCONSCRIPTS', []),
       ppapi_scons_files[file_group])
 
 pre_base_env.AddMethod(AddChromeFilesFromGroup)