Reland r215489 - Add histograms for certificate's & CA's compliance to the Baseline Requirements
Track the (Leaf, Intermediate Root) certificate (algorithm) x (size),
based on whether or not the certificate was issued before or after the
BR compliance date of 2012-12-31.
This is in advance of considering changes to security indicators.
BUG=102949
TBR=jar@chromium.org,wtc@chromium.org
Review URL: https://chromiumcodereview.appspot.com/
22203003
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@215654 0039d316-1c4b-4281-b951-d872f2087c98