GitLab

Add a separate boolean property to indicate that a client certificate
is hardware (TPM) backed. Certificate manager should disable the export
button for such certificates because there is no way to extract the
private key from the TPM.

BUG=126886
TEST=lumpy

Review URL: https://chromiumcodereview.appspot.com/10407072
Patch from Haixia Shi <hshi@chromium.org>.

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@138314 0039d316-1c4b-4281-b951-d872f2087c98