Fix null annotations, and move checks into RequestFinishedInfo

Fix null annotations, and move checks into RequestFinishedInfo

RequestFinishedInfo.getAnnotations() was returning null instead of an
empty collection when used with BidirectionalStream. It now returns an
empty collection instead, and the code to do this is moved out of the
builders into RequestFinishedInfo.

BUG=662409
Committed: https://crrev.com/e9d1b6c7804b11669012145c313e9adc58271684
Cr-Commit-Position: refs/heads/master@{#430013}

[mgersh, 2016-11-04 17:17:09]

mgersh@chromium.org changed reviewers:
+ kapishnikov@chromium.org

[mgersh, 2016-11-04 17:17:09]

New version of the one I sent before lunch. PTAL.

[xunjieli, 2016-11-04 17:20:40]

xunjieli@chromium.org changed reviewers:
+ xunjieli@chromium.org

[xunjieli, 2016-11-04 17:20:40]

lgtm

[mgersh, 2016-11-04 20:47:21]

The CQ bit was checked by mgersh@chromium.org

[commit-bot: I haz the power, 2016-11-04 20:47:55]

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, 2016-11-04 21:08:08]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-11-04 21:10:19]

Description was changed from

==========
Fix null annotations, and move checks into RequestFinishedInfo

RequestFinishedInfo.getAnnotations() was returning null instead of an
empty collection when used with BidirectionalStream. It now returns an
empty collection instead, and the code to do this is moved out of the
builders into RequestFinishedInfo.

BUG=662409
==========

to

==========
Fix null annotations, and move checks into RequestFinishedInfo

RequestFinishedInfo.getAnnotations() was returning null instead of an
empty collection when used with BidirectionalStream. It now returns an
empty collection instead, and the code to do this is moved out of the
builders into RequestFinishedInfo.

BUG=662409

Committed: https://crrev.com/e9d1b6c7804b11669012145c313e9adc58271684
Cr-Commit-Position: refs/heads/master@{#430013}
==========

[commit-bot: I haz the power, 2016-11-04 21:10:20]

Patchset 1 (id:??) landed as
https://crrev.com/e9d1b6c7804b11669012145c313e9adc58271684
Cr-Commit-Position: refs/heads/master@{#430013}