disable pnacl by default

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 445 matching lines @@
   command = env.GetHeadlessPrefix() + [
       '${PYTHON}', python_tester_script,
       '--browser_path', env.ChromeBinary(),
       '--url', url,
       # Fail if there is no response for X seconds.
       '--timeout', str(timeout)]
   for dep_file in files:
     command.extend(['--file', dep_file])
   for extension in extensions:
     command.extend(['--extension', extension])
+  if env.Bit('bitcode'):
+    # Enable the installed version of pnacl, and point to a custom install
+    # directory for testing purposes.
+    browser_flags.append('--enable-pnacl')
   for dest_path, dep_file in map_files:
     command.extend(['--map_file', dest_path, dep_file])
   for file_ext, mime_type in mime_types:
     command.extend(['--mime_type', file_ext, mime_type])
   command.extend(['--serving_dir', '${NACL_SDK_LIB}'])
   command.extend(['--serving_dir', '${LIB_DIR}'])
   if 'browser_tester_bw' in ARGUMENTS:
     command.extend(['-b', ARGUMENTS['browser_tester_bw']])
   if not nmfs is None:
     for nmf_file in nmfs:
@@ skipping 88 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)