FYI.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/e9d1b6c7804b11669012145c313e9adc58271684

commit e9d1b6c7804b11669012145c313e9adc58271684
Author: mgersh <mgersh@chromium.org>
Date: Fri Nov 04 21:07:40 2016

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 

Review-Url: https://codereview.chromium.org/2476983002
Cr-Commit-Position: refs/heads/master@{#430013}

[modify] https://crrev.com/e9d1b6c7804b11669012145c313e9adc58271684/components/cronet/android/api/src/org/chromium/net/RequestFinishedInfo.java
[modify] https://crrev.com/e9d1b6c7804b11669012145c313e9adc58271684/components/cronet/android/java/src/org/chromium/net/impl/CronetUrlRequest.java
[modify] https://crrev.com/e9d1b6c7804b11669012145c313e9adc58271684/components/cronet/android/java/src/org/chromium/net/impl/UrlRequestBuilderImpl.java
[modify] https://crrev.com/e9d1b6c7804b11669012145c313e9adc58271684/components/cronet/android/test/javatests/src/org/chromium/net/BidirectionalStreamTest.java