Fix for blinking/corrupted text in Canvas 2D.

Ensure that we update the drawToken for a glyph's plot every time it is
used, not just when the glyph is first added.

BUG=303803
R=junov@chromium.org, bsalomon@google.com

Author: jvanverth@google.com

Review URL: https://codereview.chromium.org/26253003

git-svn-id: http://skia.googlecode.com/svn/trunk/src@11637 2bbb7eff-a529-9590-31e7-b0007b416f81
3 files changed