Dump inspector traffic to stderr for all tests under inspector/sources/debugger-step

Dump inspector traffic to stderr for all tests under inspector/sources/debugger-step

The test fails intermittently because the front-end receive response to a command that it hasn't sent. I enabled logging for all tests in the same folder to see if the message is from one of them.

BUG=498710
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=197113

[yurys, 2015-06-15 11:51:22]

yurys@chromium.org changed reviewers:
+ alph@chromium.org, kozyatinskiy@chromium.org

[yurys, 2015-06-15 11:51:27]

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

[commit-bot: I haz the power, 2015-06-15 11:51:39]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1177373005/1

[alph, 2015-06-15 11:52:31]

lgtm

[yurys, 2015-06-15 11:53:58]

The CQ bit was unchecked by yurys@chromium.org

[yurys, 2015-06-15 11:54:01]

The CQ bit was checked by yurys@chromium.org

[commit-bot: I haz the power, 2015-06-15 11:54:14]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1177373005/1

[commit-bot: I haz the power, 2015-06-15 14:08:54]

Committed patchset #1 (id:1) as
https://src.chromium.org/viewvc/blink?view=rev&revision=197113