Create a LazyInstance abstraction.

base/SConscript

 # 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.
 
 Import('env')
 
 env = env.Clone()
 env_tests = env.Clone()
 
 env.Prepend(
@@ skipping 22 matching lines @@
     'base_paths.cc',
     'base_switches.cc',
     'bzip2_error_handler.cc',
     'command_line.cc',
     'debug_util.cc',
     'file_util.cc',
     'histogram.cc',
     'icu_util.cc',
     'json_reader.cc',
     'json_writer.cc',
+    'lazy_instance.cc',
     'lock.cc',
     'logging.cc',
     'md5.cc',
     'memory_debug.cc',
     'message_loop.cc',
     'message_pump_default.cc',
     'non_thread_safe.cc',
     'path_service.cc',
     'pickle.cc',
     'ref_counted.cc',
@@ skipping 173 matching lines @@
 # These test files work on *all* platforms; tests that don't work
 # cross-platform live below.
 test_files = [
     'at_exit_unittest.cc',
     'atomicops_unittest.cc',
     'command_line_unittest.cc',
     'condition_variable_unittest.cc',
     'histogram_unittest.cc',
     'json_reader_unittest.cc',
     'json_writer_unittest.cc',
+    'lazy_instance_unittest.cc',
     'linked_ptr_unittest.cc',
     'message_loop_unittest.cc',
     'observer_list_unittest.cc',
     'path_service_unittest.cc',
     'pickle_unittest.cc',
     'pr_time_unittest.cc',
     'ref_counted_unittest.cc',
     'run_all_unittests.cc',
     'scoped_ptr_unittest.cc',
     'sha2_unittest.cc',
@@ skipping 76 matching lines @@
 env.Alias('base', ['.', installed_base_unittests, icudata])
 
 # TODO(sgk) should this be moved into base.lib like everything else?  This will
 # require updating a bunch of other SConscripts which link directly against
 # this generated object file.
 env_tests.StaticObject('perftimer.cc')
 
 # Since run_all_perftests supplies a main, we cannot have it in base.lib
 env_tests.StaticObject('run_all_perftests.cc')