Add a simple cache of certificates for SSL client authentication.
It is based on FtpAuthCache and will be used in similar ways.  The
the only difference is that the authentication data is a certificate
rather than username and password.

R=eroman
BUG=http://crbug.com/318
TEST=new unit tests.
Review URL: http://codereview.chromium.org/132004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@18735 0039d316-1c4b-4281-b951-d872f2087c98
6 files changed