Call Python version of oilplan plugin flags script.

Call Python version of oilplan plugin flags script.

Also do this on Windows if blink_gc_plugin is set (which it isn't
by default, so no behavior change).

Depends on https://codereview.chromium.org/1137873002/

BUG=467287
R=sigbjornf@opera.com
TBR=jochen

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=195155

[Nico, 2015-05-08 23:55:43]

thakis@chromium.org changed reviewers:
+ hans@chromium.org

[sof, 2015-05-09 20:21:46]

sigbjornf@opera.com changed reviewers:
+ sigbjornf@opera.com

[sof, 2015-05-09 20:21:46]

lgtm (non-owner, but oilpan plugin contributor.)

[Nico, 2015-05-09 20:26:17]

thakis@chromium.org changed reviewers:
+ jochen@chromium.org

[Nico, 2015-05-09 20:26:18]

tbr jochen for Source/OWNERS

[Nico, 2015-05-09 20:26:22]

The CQ bit was checked by thakis@chromium.org

[commit-bot: I haz the power, 2015-05-09 20:26:37]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1135853003/1

[Nico, 2015-05-09 22:42:36]

Committed patchset #1 (id:1) manually as 195155 (presubmit successful).

[hans, 2015-05-11 17:57:24]

lgtm too

[Nico, 2015-08-28 23:02:11]

Patchset #2 (id:20001) has been deleted