[TextBlob] Fix LCD text handling.

The LCD bit is captured in run paints at blob build time, so any
adjustments should be performed at that point. Also, text encoding is
handled similarly, and we don't need to set it on draw paints.

R=jbroman@chromium.org,reed@chromium.org,eae@chromium.org
BUG=412445

Review URL: https://codereview.chromium.org/551183005

git-svn-id: svn://svn.chromium.org/blink/trunk@181757 bbb929c8-8fbe-4397-9dbb-9b2b20218538