[cctest] adding --help option to output basic information about cctest

[cctest] adding --help option to output basic information about cctest
[run-tests.py]
- adding more detailed information about the flags
- show more detailed error message on failing Popen commands

BUG=

Committed: https://crrev.com/eecf6cbd9735715a2fdc3579a75eb67849bfb733
Cr-Commit-Position: refs/heads/master@{#30997}

[Camillo Bruni, 2015-09-28 15:26:13]

cbruni@chromium.org changed reviewers:
+ machenbach@chromium.org

[Camillo Bruni, 2015-09-28 15:26:13]

The CQ bit was checked by cbruni@chromium.org

[Camillo Bruni, 2015-09-28 15:26:13]

PTAL
After spending again 15mins figureing out how to run cctest and run-tests.py I
added some more documentation :)

[commit-bot: I haz the power, 2015-09-28 15:26:23]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1369343002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1369343002/1

[commit-bot: I haz the power, 2015-09-28 15:26:24]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2015-09-28 15:26:25]

No L-G-T-M from a valid reviewer yet. Only full committers are accepted.
Even if an L-G-T-M may have been provided, it was from a non-committer,
_not_ a full super star committer.
See http://www.chromium.org/getting-involved/become-a-committer
Note that this has nothing to do with OWNERS files.

[Michael Achenbach, 2015-09-29 08:11:14]

lgtm

https://codereview.chromium.org/1369343002/diff/1/tools/run-tests.py
File tools/run-tests.py (right):

https://codereview.chromium.org/1369343002/diff/1/tools/run-tests.py#newcode225
tools/run-tests.py:225: help="The test modes in which to run (comma-separated):
%s" % MODES.keys(),
Here is a long-standing problem hiding. With buildbot or ninja, the modes are
with capitals, with make not.

[Camillo Bruni, 2015-09-29 08:18:09]

The CQ bit was checked by cbruni@chromium.org

[Camillo Bruni, 2015-09-29 08:18:10]

The patchset sent to the CQ was uploaded after l-g-t-m from
machenbach@chromium.org
Link to the patchset: https://codereview.chromium.org/1369343002/#ps20001
(title: "extending help comment")

[commit-bot: I haz the power, 2015-09-29 08:18:20]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1369343002/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1369343002/20001

[commit-bot: I haz the power, 2015-09-29 08:41:30]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-09-29 08:41:52]

Patchset 2 (id:??) landed as
https://crrev.com/eecf6cbd9735715a2fdc3579a75eb67849bfb733
Cr-Commit-Position: refs/heads/master@{#30997}

[Camillo Bruni, 2015-09-29 11:00:07]

https://codereview.chromium.org/1369343002/diff/1/tools/run-tests.py
File tools/run-tests.py (right):

https://codereview.chromium.org/1369343002/diff/1/tools/run-tests.py#newcode225
tools/run-tests.py:225: help="The test modes in which to run (comma-separated):
%s" % MODES.keys(),
On 2015/09/29 at 08:11:14, Michael Achenbach wrote:
> Here is a long-standing problem hiding. With buildbot or ninja, the modes are
with capitals, with make not.

Yeah I know, since I use the ninja setup locally :/ but at least with the file
not found warning you'll figure out quickly that probably you need uppercase.
I'll add a comment.