Alter GM's --mpd option to write out images

Alter GM's --mpd option to write out images

Committed: https://skia.googlesource.com/skia/+/ed31343805e8cc416ff6b2de28aefffa59c975ed

[robertphillips, 2014-12-16 16:12:39]

robertphillips@google.com changed reviewers:
+ borenet@google.com, bsalomon@google.com

[bsalomon, 2014-12-16 16:33:53]

rubberstamp lgtmp

[robertphillips, 2014-12-16 16:38:24]

The CQ bit was checked by robertphillips@google.com

[commit-bot: I haz the power, 2014-12-16 16:39:09]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/811863002/1

[commit-bot: I haz the power, 2014-12-16 16:39:10]

Note for Reviewers:
The CQ is waiting for an approval.
If you believe that the CL is not ready yet, or if you would like to L-G-T-M
with comments then please uncheck the CQ checkbox.

Waiting for LGTM from valid reviewer(s) till 2014-12-16 22:39 UTC

[robertphillips, 2014-12-16 16:39:23]

The CQ bit was unchecked by robertphillips@google.com

[borenet, 2014-12-16 17:30:16]

LGTM with the caveat that I don't really know this code.

[robertphillips, 2014-12-16 17:31:13]

The CQ bit was checked by robertphillips@google.com

[commit-bot: I haz the power, 2014-12-16 17:31:39]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/811863002/1

[commit-bot: I haz the power, 2014-12-16 17:31:47]

Committed patchset #1 (id:1) as
https://skia.googlesource.com/skia/+/ed31343805e8cc416ff6b2de28aefffa59c975ed