Make --wait-for-debugger work for mandoline launcher process.

Make --wait-for-debugger work for mandoline launcher process.

If specified without any switch values, it'll make the launcher process wait. Otherwise one can use an app name of "launcher".

Committed: https://crrev.com/a30f77e9853d7583ed53f1048ac178194737bf38
Cr-Commit-Position: refs/heads/master@{#329186}

[jam, 2015-05-11 17:14:31]

jam@chromium.org changed reviewers:
+ sky@chromium.org

[sky, 2015-05-11 17:17:16]

LGTM

[jam, 2015-05-11 17:22:24]

The CQ bit was checked by jam@chromium.org

[commit-bot: I haz the power, 2015-05-11 17:25:47]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1140553002/1

[commit-bot: I haz the power, 2015-05-11 17:46:27]

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

[commit-bot: I haz the power, 2015-05-11 17:46:28]

Try jobs failed on following builders:
  chromium_presubmit on tryserver.chromium.linux (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.linux/builders/chromium_presub...)

[jam, 2015-05-11 17:58:25]

The CQ bit was checked by jam@chromium.org

[jam, 2015-05-11 17:58:25]

The patchset sent to the CQ was uploaded after l-g-t-m from sky@chromium.org
Link to the patchset: https://codereview.chromium.org/1140553002/#ps20001
(title: " ")

[commit-bot: I haz the power, 2015-05-11 18:00:10]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1140553002/20001

[commit-bot: I haz the power, 2015-05-11 18:11:50]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-05-11 18:13:31]

Patchset 2 (id:??) landed as
https://crrev.com/a30f77e9853d7583ed53f1048ac178194737bf38
Cr-Commit-Position: refs/heads/master@{#329186}