Add paint chunk recording to ObjectPainter

ObjectPainter only directly paints though paintOutline so we only need
to add a single PaintCommandRecorder. This patch includes some minor
cleanup of outlineOffset and outlineWidth.

Review URL: https://codereview.chromium.org/665333003

git-svn-id: svn://svn.chromium.org/blink/trunk@184119 bbb929c8-8fbe-4397-9dbb-9b2b20218538