Add paint chunk recording to ImagePainter

On the path toward enabling fast/block with the SlimmingPaint
flag enabled. Here's ImagePainter!

R=pdr@chromium.org

Review URL: https://codereview.chromium.org/665893004

git-svn-id: svn://svn.chromium.org/blink/trunk@184039 bbb929c8-8fbe-4397-9dbb-9b2b20218538