Port some of the base module to FreeBSD. Extracted from
http://codereview.chromium.org/172032.

The patch is contributed by Ben Laurie of Google.
Original review URL: http://codereview.chromium.org/180037

R=wtc
BUG=none
TEST=none
Review URL: http://codereview.chromium.org/183016

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@24950 0039d316-1c4b-4281-b951-d872f2087c98

• base/base_paths.h[diff]
• base/base_paths_linux.cc[diff]
• base/native_library.h[diff]
• base/platform_thread.h[diff]
• base/port.h[diff]
• base/process_util.h[diff]
• base/process_util_posix.cc[diff]
• base/sys_info_posix.cc[diff]
• base/third_party/nspr/prcpucfg.h[diff]
• base/third_party/nspr/prcpucfg_freebsd.h[Added - diff]
• base/third_party/nspr/prtime.cc[diff]
• base/time_posix.cc[diff]