Docserver: Add _query_commit handler

Docserver: Add _query_commit handler

This adds a simple utility handler to allow developers to
query named commit data stored in the CommitTracker.

For example, to find out which commit's cache is supplying
data to the live instance, one may query /_query_commit/master

This also properly requires _enqueue and _refresh requests
to come from authenticated users (i.e. admins or the cron
job).

BUG=None
R=kalman@chromium.org
NOTRY=True

Committed: https://crrev.com/68c65a48b958c1a5e029cece19ef5eb01ab99fff
Cr-Commit-Position: refs/heads/master@{#301385}

[Ken Rockot(use gerrit already), 2014-10-25 00:41:16]

A little patch

[not at google - send to devlin, 2014-10-25 01:26:15]

lgtm

https://codereview.chromium.org/679813004/diff/1/chrome/common/extensions/doc...
File chrome/common/extensions/docs/server2/handler.py (right):

https://codereview.chromium.org/679813004/diff/1/chrome/common/extensions/doc...
chrome/common/extensions/docs/server2/handler.py:32: class
_QueryCommitServlet(Servlet):
comments

[Ken Rockot(use gerrit already), 2014-10-27 17:02:35]

https://codereview.chromium.org/679813004/diff/1/chrome/common/extensions/doc...
File chrome/common/extensions/docs/server2/handler.py (right):

https://codereview.chromium.org/679813004/diff/1/chrome/common/extensions/doc...
chrome/common/extensions/docs/server2/handler.py:32: class
_QueryCommitServlet(Servlet):
On 2014/10/25 01:26:14, kalman wrote:
> comments

Done.

[Ken Rockot(use gerrit already), 2014-10-27 17:02:40]

The CQ bit was checked by rockot@chromium.org

[commit-bot: I haz the power, 2014-10-27 17:04:03]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/679813004/20001

[commit-bot: I haz the power, 2014-10-27 17:10:28]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2014-10-27 17:11:14]

Patchset 2 (id:??) landed as
https://crrev.com/68c65a48b958c1a5e029cece19ef5eb01ab99fff
Cr-Commit-Position: refs/heads/master@{#301385}