[worklets] Change paintWorklet method to non-const to remove mutable member.

[worklets] Change paintWorklet method to non-const to remove mutable member.

Similar change occurred for WindowAnimationWorklet.

BUG=567358
Committed: https://crrev.com/9d18989c467785e5585093e7e9aad15f6abcab09
Cr-Commit-Position: refs/heads/master@{#408562}

[ikilpatrick, 2016-07-29 00:57:13]

ikilpatrick@chromium.org changed reviewers:
+ yhirano@chromium.org

[yhirano, 2016-07-29 01:00:37]

lgtm

[ikilpatrick, 2016-07-29 01:31:21]

The CQ bit was checked by ikilpatrick@chromium.org

[commit-bot: I haz the power, 2016-07-29 01:31:49]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2016-07-29 02:52:14]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-07-29 02:53:52]

Description was changed from

==========
[worklets] Change paintWorklet method to non-const to remove mutable member.

Similar change occurred for WindowAnimationWorklet.

BUG=567358
==========

to

==========
[worklets] Change paintWorklet method to non-const to remove mutable member.

Similar change occurred for WindowAnimationWorklet.

BUG=567358

Committed: https://crrev.com/9d18989c467785e5585093e7e9aad15f6abcab09
Cr-Commit-Position: refs/heads/master@{#408562}
==========

[commit-bot: I haz the power, 2016-07-29 02:53:53]

Patchset 1 (id:??) landed as
https://crrev.com/9d18989c467785e5585093e7e9aad15f6abcab09
Cr-Commit-Position: refs/heads/master@{#408562}