DevTools: Highlight printed boolean tokens in console.

BUG=363970
R=pfeldman
NOTRY=true

Review URL: https://codereview.chromium.org/256593012

git-svn-id: svn://svn.chromium.org/blink/trunk@172867 bbb929c8-8fbe-4397-9dbb-9b2b20218538