Bug 1020847 - Add handwriting IME for Simplified Chinese

After bug 1044525, we explicitly want to make sure anything under `js/keyboard/` not to worry about the DOM and have `js/view` take care of the DOM instead. Maybe a lot of code in this file should move to the new `js/view` file and the manager should just send the absolute X-Y to the view (indirectly) and have the view draw the stroke itself?