ash: Access the Canvas for painting through PaintRecorder.

ash: Access the Canvas for painting through PaintRecorder.

The PaintContext will not be backed by a Canvas in the future, so do
not grab the canvas from it directly. Instead use a PaintRecorder.

R=oshima
BUG=466426
Committed: https://crrev.com/a59147554aaa82da73512da5f9d61e9265d54bc0
Cr-Commit-Position: refs/heads/master@{#324071}

[oshima, 2015-04-07 16:54:48]

lgtm

[danakj, 2015-04-07 18:05:54]

The CQ bit was checked by danakj@chromium.org

[commit-bot: I haz the power, 2015-04-07 18:06:29]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1062003003/20001

[commit-bot: I haz the power, 2015-04-07 18:10:47]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-04-07 18:11:43]

Patchset 2 (id:??) landed as
https://crrev.com/a59147554aaa82da73512da5f9d61e9265d54bc0
Cr-Commit-Position: refs/heads/master@{#324071}