Add the high-level interface for verifying SCTs over multiple logs
This interface (and the default implementation) verify SCT lists obtained
during the TLS handshake or from OCSP stapling, as well as embedded ones.
The result will be used to modify the ssl_info with indicatior of CT status.

The next, and final, patch will wire the CTVerifier to the SSL client socket.

BUG=309578

Review URL: https://codereview.chromium.org/67513008

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@237008 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 237008
Remove obsolete dependency from metro_viewer_messages

This is just a CL clean-up CL which removes an obsolete dependency on skia from metro_viewer_messages.

BUG=none
TEST=none

Review URL: https://codereview.chromium.org/83793008

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@237009 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 237009