Add an option to ignore a dirty tree to roll_dep.py

Add an option to ignore a dirty tree to roll_dep.py

BUG=554638
TBR=maruel
TESTED=locally verified that two deps can be rolled

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=297553

[smut, 2015-11-14 00:26:48]

Description was changed from

==========
Add an option to ignore a dirty tree to roll_dep.py

BUG=554638
==========

to

==========
Add an option to ignore a dirty tree to roll_dep.py

BUG=554638
TBR=maruel
==========

[smut, 2015-11-14 00:26:48]

smut@google.com changed reviewers:
+ maruel@chromium.org

[smut, 2015-11-14 00:27:41]

My use case involves rolling two dependencies that rely on one another together.
I need to be able to do consecutive roll_dep.py invocations.

[smut, 2015-11-14 00:27:58]

Description was changed from

==========
Add an option to ignore a dirty tree to roll_dep.py

BUG=554638
TBR=maruel
==========

to

==========
Add an option to ignore a dirty tree to roll_dep.py

BUG=554638
TBR=maruel
TESTED=locally verified that two deps can be rolled
==========

[smut, 2015-11-14 00:28:18]

The CQ bit was checked by smut@google.com

[commit-bot: I haz the power, 2015-11-14 00:28:29]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1445833003/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1445833003/1

[smut, 2015-11-14 00:46:27]

On 2015/11/14 00:28:29, commit-bot: I haz the power wrote:
> CQ is trying da patch. Follow status at
>  https://chromium-cq-status.appspot.com/patch-status/1445833003/1
> View timeline at
>  https://chromium-cq-status.appspot.com/patch-timeline/1445833003/1

This is slow as hell. It's been 20 minutes. The try job is green:
https://build.chromium.org/p/tryserver.chromium.linux/builders/depot_tools_pr...

[smut, 2015-11-14 00:46:30]

The CQ bit was unchecked by smut@google.com

[smut, 2015-11-14 00:46:43]

Committed patchset #1 (id:1) manually as 297553.

[M-A Ruel, 2015-11-14 01:54:21]

https://codereview.chromium.org/1445833003/diff/1/roll_dep.py
File roll_dep.py (right):

https://codereview.chromium.org/1445833003/diff/1/roll_dep.py#newcode71
roll_dep.py:71: ignore_dirty_tree=False):
Remove the default value