Prerender: Add timeout to appcache waiting in NoStatePrefetch browser test.

Prerender: Add timeout to appcache waiting in NoStatePrefetch browser test.

This may fix flakiness in this test. I have not been able to reproduce the
flakes locally, so I'll have to observe the dashboard and see if this eliminates
the occasional timeout.

BUG=733504
Review-Url: https://codereview.chromium.org/2968723002
Cr-Commit-Position: refs/heads/master@{#483979}
Committed: https://chromium.googlesource.com/chromium/src/+/3b32efaba81015f0f4aae00726bbcdeb0623bb9c

[mattcary, 2017-06-30 14:56:37]

mattcary@chromium.org changed reviewers:
+ lizeb@chromium.org

[Benoit L, 2017-07-03 08:26:49]

On 2017/06/30 14:56:38, mattcary wrote:

lgtm

[mattcary, 2017-07-03 09:41:12]

The CQ bit was checked by mattcary@chromium.org

[commit-bot: I haz the power, 2017-07-03 09:41:20]

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, 2017-07-03 10:22:06]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1499074872782710, "parent_rev":
"b72e254883853b9f1e8ee5dc013dff6c2dc5b05a", "commit_rev":
"373528eaf00319afba0ed3601eaa570d45616e7f"}

[commit-bot: I haz the power, 2017-07-03 10:22:22]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1499074872782710, "parent_rev":
"d7fb2162f485c9df47ea3bdb52541ceded99678b", "commit_rev":
"3b32efaba81015f0f4aae00726bbcdeb0623bb9c"}

[commit-bot: I haz the power, 2017-07-03 10:22:35]

Description was changed from

==========
Prerender: Add timeout to appcache waiting in NoStatePrefetch browser test.

This may fix flakiness in this test. I have not been able to reproduce the
flakes locally, so I'll have to observe the dashboard and see if this eliminates
the occasional timeout.

BUG=733504
==========

to

==========
Prerender: Add timeout to appcache waiting in NoStatePrefetch browser test.

This may fix flakiness in this test. I have not been able to reproduce the
flakes locally, so I'll have to observe the dashboard and see if this eliminates
the occasional timeout.

BUG=733504

Review-Url: https://codereview.chromium.org/2968723002
Cr-Commit-Position: refs/heads/master@{#483979}
Committed:
https://chromium.googlesource.com/chromium/src/+/3b32efaba81015f0f4aae00726bb...
==========

[commit-bot: I haz the power, 2017-07-03 10:22:38]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/chromium/src/+/3b32efaba81015f0f4aae00726bb...