[TTS] Log a warning when Contextual Cards backend fails.

[TTS] Log a warning when Contextual Cards backend fails.

When Contextual Search attempts to use the Contextual Cards backend,
the response now gives backend-connection information so we can tell
if the backend failed for some reason.  If so, we log a warning on
a debug build.

BUG=647041
Committed: https://crrev.com/0d91f3915fb9a55f9ede3bc3e45328c85e32b160
Cr-Commit-Position: refs/heads/master@{#422485}

[Donn Denman, 2016-10-03 17:00:12]

donnd@chromium.org changed reviewers:
+ twellington@chromium.org

[Donn Denman, 2016-10-03 17:00:12]

Theresa, PTAL.

[Theresa, 2016-10-03 17:28:03]

The CQ bit was checked by twellington@chromium.org

[Theresa, 2016-10-03 17:28:03]

lgtm

[commit-bot: I haz the power, 2016-10-03 17:28:32]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2016-10-03 19:16:50]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-10-03 19:20:20]

Description was changed from

==========
[TTS] Log a warning when Contextual Cards backend fails.

When Contextual Search attempts to use the Contextual Cards backend,
the response now gives backend-connection information so we can tell
if the backend failed for some reason.  If so, we log a warning on
a debug build.

BUG=647041
==========

to

==========
[TTS] Log a warning when Contextual Cards backend fails.

When Contextual Search attempts to use the Contextual Cards backend,
the response now gives backend-connection information so we can tell
if the backend failed for some reason.  If so, we log a warning on
a debug build.

BUG=647041

Committed: https://crrev.com/0d91f3915fb9a55f9ede3bc3e45328c85e32b160
Cr-Commit-Position: refs/heads/master@{#422485}
==========

[commit-bot: I haz the power, 2016-10-03 19:20:21]

Patchset 1 (id:??) landed as
https://crrev.com/0d91f3915fb9a55f9ede3bc3e45328c85e32b160
Cr-Commit-Position: refs/heads/master@{#422485}