Iplement the idle timer for Linux using libxss.

base/base_lib.scons

 # Copyright (c) 2006-2008 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.
 
 __doc__ = """
 Configuration for building base.lib / libbase.a.
 """
 
 Import('env')
 
@@ skipping 78 matching lines @@
 
 if env['PLATFORM'] in ('posix', 'darwin'):
   # Remove files that still need to be ported from the input_files list.
   # TODO(port): delete files from this list as they get ported.
   to_be_ported_files = [
     'clipboard_util.cc',
     'event_recorder.cc',
     'file_version_info.cc',
 
     # This group all depends on MessageLoop.
+
+    # We have an implementation of idle_timer, but it's unclear if we want it
+    # yet, so it's commented out for now.  Leave this 'unported'.
     'idle_timer.cc',
+
     'object_watcher.cc',
     'watchdog.cc',
 
     'resource_util.cc',  # Uses HMODULE, but may be abstractable.
   ]
   for remove in to_be_ported_files:
       input_files.remove(remove)
 
 if env['PLATFORM'] == 'win32':
   input_files.extend([
@@ skipping 76 matching lines @@
       'hmac_nss.cc',
       'message_pump_glib.cc',
       'nss_init.cc',
       'process_posix.cc',
       'process_util_linux.cc',
       'sys_string_conversions_linux.cc',
       'worker_pool.cc',
   ])
 
 env.ChromeStaticLibrary('base', input_files)