Add background fetch capability to ios tests

Add background fetch capability to ios tests

Application has this capability, kif tests should mirror it.

BUG=421798
Committed: https://crrev.com/25aaa43552d4ceac737bee614e2e181de8946f79
Cr-Commit-Position: refs/heads/master@{#329621}

[Olivier, 2015-05-11 16:21:48]

olivierrobin@chromium.org changed reviewers:
+ pkl@chromium.org

[pkl (ping after 24h if needed), 2015-05-12 21:50:55]

LGTM, but please fix description s/miror/mirror/

[Olivier, 2015-05-13 08:17:56]

The CQ bit was checked by olivierrobin@chromium.org

[commit-bot: I haz the power, 2015-05-13 08:18:08]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1135813006/1

[commit-bot: I haz the power, 2015-05-13 08:18:10]

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

[commit-bot: I haz the power, 2015-05-13 08:18:10]

No LGTM from a valid reviewer yet. Only full committers are accepted.
Even if an LGTM may have been provided, it was from a non-committer,
_not_ a full super star committer.
See http://www.chromium.org/getting-involved/become-a-committer
Note that this has nothing to do with OWNERS files.

[Olivier, 2015-05-13 08:21:35]

olivierrobin@chromium.org changed reviewers:
+ sdefresne@chromium.org

[sdefresne, 2015-05-13 12:48:38]

The CQ bit was checked by sdefresne@chromium.org

[sdefresne, 2015-05-13 12:48:39]

lgtm

[commit-bot: I haz the power, 2015-05-13 12:48:48]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1135813006/1

[commit-bot: I haz the power, 2015-05-13 12:56:29]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-05-13 12:58:13]

Patchset 1 (id:??) landed as
https://crrev.com/25aaa43552d4ceac737bee614e2e181de8946f79
Cr-Commit-Position: refs/heads/master@{#329621}