[test] More debugging output in test runner.

[test] More debugging output in test runner.

Also use again the taskkill method, recently removed in
https://codereview.chromium.org/1156133006/

BUG=chromium:485932
LOG=n
TBR=jkummerow@chromium.org
NOTREECHECKS=true

Committed: https://crrev.com/6a1093182064ffaf560542c3598045dc37842a65
Cr-Commit-Position: refs/heads/master@{#29001}

[Michael Achenbach, 2015-06-12 13:01:29]

machenbach@chromium.org changed reviewers:
+ jkummerow@chromium.org, tandrii@chromium.org

[Michael Achenbach, 2015-06-12 13:04:06]

PTAL

[Michael Achenbach, 2015-06-12 13:04:11]

The CQ bit was checked by machenbach@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2015-06-12 13:04:20]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1177903005/20001

[tandrii(chromium), 2015-06-12 13:20:53]

lgtm

[commit-bot: I haz the power, 2015-06-12 13:29:03]

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

[commit-bot: I haz the power, 2015-06-12 13:29:04]

Dry run: This issue passed the CQ dry run.

[Michael Achenbach, 2015-06-12 13:42:39]

The CQ bit was checked by machenbach@chromium.org

[commit-bot: I haz the power, 2015-06-12 13:42:48]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1177903005/20001

[commit-bot: I haz the power, 2015-06-12 13:43:58]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-06-12 13:44:05]

Patchset 2 (id:??) landed as
https://crrev.com/6a1093182064ffaf560542c3598045dc37842a65
Cr-Commit-Position: refs/heads/master@{#29001}