Add experimental support for python in 'git cl format'

Add experimental support for python in 'git cl format'

Based on yapf (https://github.com/google/yapf) this
formatter currently only works with --full.  It defaults
to pep8 style and projects that use a different style
can add .style.yapf to the top level.

Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=295547

[Sam Clegg, 2015-06-05 23:00:33]

sbc@chromium.org changed reviewers:
+ maruel@chromium.org

[M-A Ruel, 2015-06-05 23:09:53]

lgtm

https://codereview.chromium.org/1156743008/diff/1/git_cl.py
File git_cl.py (right):

https://codereview.chromium.org/1156743008/diff/1/git_cl.py#newcode3288
git_cl.py:3288: stdout = RunCommand(cmd + files, cwd=top_dir)
bYou are adding it twice, so remove line 3287.

[Sam Clegg, 2015-06-05 23:13:45]

https://codereview.chromium.org/1156743008/diff/1/git_cl.py
File git_cl.py (right):

https://codereview.chromium.org/1156743008/diff/1/git_cl.py#newcode3288
git_cl.py:3288: stdout = RunCommand(cmd + files, cwd=top_dir)
On 2015/06/05 23:09:53, M-A Ruel wrote:
> bYou are adding it twice, so remove line 3287.

Done.

[Sam Clegg, 2015-06-05 23:13:53]

The CQ bit was checked by sbc@chromium.org

[Sam Clegg, 2015-06-05 23:13:53]

The patchset sent to the CQ was uploaded after l-g-t-m from maruel@chromium.org
Link to the patchset: https://codereview.chromium.org/1156743008/#ps20001
(title: " ")

[commit-bot: I haz the power, 2015-06-05 23:14:18]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1156743008/20001

[commit-bot: I haz the power, 2015-06-05 23:16:56]

Committed patchset #2 (id:20001) as
http://src.chromium.org/viewvc/chrome?view=rev&revision=295547

[Dirk Pranke, 2015-06-05 23:17:53]

+joelo, fyi, since we were talking about this possibly replacing
format-webkitpy

On Fri, Jun 5, 2015 at 4:16 PM, 'commit-bot: I haz the power' via
codereview.chromium.org <reply@chromiumcodereview-hr.appspotmail.com> wrote:

> Committed patchset #2 (id:20001) as
> http://src.chromium.org/viewvc/chrome?view=rev&revision=295547
>
> https://codereview.chromium.org/1156743008/
>

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