modified:   base/os/md5.cc
	modified:   base/os/md5.h
	modified:   base/os_test/Makefile
	new file:   base/os_test/condition_test.cc
	new file:   base/os_test/lock_test.cc
	new file:   base/os_test/md5_test.cc
	modified:   base/os_test/mutex_test.cc
	modified:   base/os_test/singleton_test.cc
	modified:   base/os_test/thread_base_test.cc
	modified:   base/os_test/thread_test.cc