[test] Fix missing heartbeats in test runner.

[test] Fix missing heartbeats in test runner.

TBR=jkummerow@chromium.org

Committed: https://crrev.com/e728125131a6a6638da0af1d0b95c5d3f368667b
Cr-Commit-Position: refs/heads/master@{#28808}

[Michael Achenbach, 2015-06-05 09:21:02]

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

[Michael Achenbach, 2015-06-05 09:21:02]

PTAL. The hearbeat method is simply not called when the indicators are chained.
The output never shows up on the bots and the recipes can sometimes timeout,
like:
http://build.chromium.org/p/client.v8/builders/V8%20Linux%20-%20arm%20-%20sim...

Maybe the classes should be redesigned (in a follow up) to not impose such
hidden contracts.

[Michael Achenbach, 2015-06-05 09:26:08]

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

[commit-bot: I haz the power, 2015-06-05 09:26:19]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1163523008/1

[tandrii(chromium), 2015-06-05 09:34:30]

lgtm

[Michael Achenbach, 2015-06-05 09:34:56]

The CQ bit was unchecked by machenbach@chromium.org

[Michael Achenbach, 2015-06-05 09:35:01]

The CQ bit was checked by machenbach@chromium.org

[commit-bot: I haz the power, 2015-06-05 09:35:09]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1163523008/1

[commit-bot: I haz the power, 2015-06-05 09:50:57]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-06-05 09:51:10]

Patchset 1 (id:??) landed as
https://crrev.com/e728125131a6a6638da0af1d0b95c5d3f368667b
Cr-Commit-Position: refs/heads/master@{#28808}