Add xidle library to power_manager for testing how long the user has been idle

src/platform/power_manager/SConstruct

+# Copyright (c) 2009-2010 The Chromium OS 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 os
+import itertools
+
+
+Help('''\
+Type: 'scons' to build and 'scons -c' to clean\
+''')
+
+# Create a base environment including things that are likely to be common
+# to all of the objects in this directory. We pull in overrides from the
+# environment to enable cross-compile.
+base_env = Environment()
+for key in Split('CC CXX AR RANLIB LD NM'):
+  value = os.environ.get(key)
+  if value != None:
+    base_env[key] = value
+for key in Split('CFLAGS CCFLAGS CPPPATH LIBPATH'):
+  value = os.environ.get(key)
+  if value != None:
+    base_env[key] = Split(value)
+
+base_env['CPPFLAGS'] = ['-D__STDC_FORMAT_MACROS']
+
+# Fix issue with scons not passing some vars through the environment.
+for key in Split('PKG_CONFIG_LIBDIR PKG_CONFIG_PATH SYSROOT'):
+  if os.environ.has_key(key):
+    base_env['ENV'][key] = os.environ[key]
+
+# Build example program
+base_env.Append(LIBS=Split('Xss'))
+base_env.Append(CPPPATH=['..'])
+xidle = base_env.Library('xidle', ['xidle.cc'])
+xidle_example = base_env.Program('xidle-example', ['xidle-example.cc', xidle])
+Default(xidle_example)
+
+# Build unit tests
+test_env = base_env.Clone()
+test_env.Append(LIBS=['gtest'])
+test_env.Program('xidle_unittest', ['testrunner.cc', 'xidle_unittest.cc', xidle])
+tests = []