Wrote a custom pattern matcher for vmodule.

The custom pattern matcher matches any slash (forward or backward) to any
slash.  It also does not do escaping like MatchPattern().  Finally, '?'
matches exactly one character, which matches google-glog behavior
(MatchPattern() matches '?' to 0 or 1 character).

BUG=61123
TEST=New unittests

Review URL: http://codereview.chromium.org/4205005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@64661 0039d316-1c4b-4281-b951-d872f2087c98

• base/logging.h[diff]
• base/vlog.cc[diff]
• base/vlog.h[diff]
• base/vlog_unittest.cc[diff]