Add StrictTypeChecking to CRC2D.{drawFocusIfNeeded,drawCustomFocusRing}

'null' should not be allowed per current spec. so modify tests accordingly.

BUG=363148

Review URL: https://codereview.chromium.org/237063002

git-svn-id: svn://svn.chromium.org/blink/trunk@171474 bbb929c8-8fbe-4397-9dbb-9b2b20218538