Mark more tests flaky

Mark more tests flaky

idle-callback.html was also seen to fail on Linux Debug
media-document-with-download-button.htm was seen to flake on Linux Debug - test
looks fundamentally racy though

BUG=667875, 667953
TBR=caseq,qinmin
NOTRY=true

Committed: https://crrev.com/14346f829f16c989f59e726b5bc88316cd1ccdab
Cr-Commit-Position: refs/heads/master@{#434067}

[piman, 2016-11-22 23:58:51]

The CQ bit was checked by piman@chromium.org

[commit-bot: I haz the power, 2016-11-22 23:59:28]

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, 2016-11-23 00:18:42]

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

[commit-bot: I haz the power, 2016-11-23 00:18:43]

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

[piman, 2016-11-23 00:39:51]

The CQ bit was checked by piman@chromium.org

[commit-bot: I haz the power, 2016-11-23 00:40:32]

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, 2016-11-23 01:20:07]

CQ is committing da patch.

Bot data: {"patchset_id": 20001, "attempt_start_ts": 1479861591990090,
"parent_rev": "0d490a453d50b6acd138d52b25f758f5a38dc7f1", "commit_rev":
"b70009fe355d008f44b9e12b2b5de911696cc4e3"}

[commit-bot: I haz the power, 2016-11-23 01:20:34]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2016-11-23 01:22:30]

Description was changed from

==========
Mark more tests flaky

idle-callback.html was also seen to fail on Linux Debug
media-document-with-download-button.htm was seen to flake on Linux Debug - test
looks fundamentally racy though

BUG=667875,667953
TBR=caseq,qinmin
NOTRY=true
==========

to

==========
Mark more tests flaky

idle-callback.html was also seen to fail on Linux Debug
media-document-with-download-button.htm was seen to flake on Linux Debug - test
looks fundamentally racy though

BUG=667875,667953
TBR=caseq,qinmin
NOTRY=true

Committed: https://crrev.com/14346f829f16c989f59e726b5bc88316cd1ccdab
Cr-Commit-Position: refs/heads/master@{#434067}
==========

[commit-bot: I haz the power, 2016-11-23 01:22:31]

Patchset 2 (id:??) landed as
https://crrev.com/14346f829f16c989f59e726b5bc88316cd1ccdab
Cr-Commit-Position: refs/heads/master@{#434067}