Implement current/pending session description methods.

Implement current/pending session description methods.

BUG=webrtc:6917
Review-Url: https://codereview.webrtc.org/2590753002
Cr-Commit-Position: refs/heads/master@{#15722}
Committed: https://chromium.googlesource.com/external/webrtc/+/fe4a8a41adf704485b6f3bad4660fb56b58c7868

[Taylor Brandstetter, 2016-12-20 03:56:34]

deadbeef@webrtc.org changed reviewers:
+ pthatcher@webrtc.org

[Taylor Brandstetter, 2016-12-20 03:56:34]

PTAL. I ended up needing "current description" for another CL, so I decided to
implement the whole shebang.

[pthatcher1, 2016-12-21 00:59:24]

lgtm

[Taylor Brandstetter, 2016-12-21 01:12:39]

The CQ bit was checked by deadbeef@webrtc.org

[commit-bot: I haz the power, 2016-12-21 01:12:47]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.webrtc.org/...

[commit-bot: I haz the power, 2016-12-21 01:19:57]

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

[commit-bot: I haz the power, 2016-12-21 01:19:58]

Try jobs failed on following builders:
  linux_ubsan_vptr on master.tryserver.webrtc (JOB_FAILED,
http://build.chromium.org/p/tryserver.webrtc/builders/linux_ubsan_vptr/builds...)
  mac_rel on master.tryserver.webrtc (JOB_FAILED,
http://build.chromium.org/p/tryserver.webrtc/builders/mac_rel/builds/21244)

[Taylor Brandstetter, 2016-12-21 01:34:14]

The CQ bit was checked by deadbeef@webrtc.org

[Taylor Brandstetter, 2016-12-21 01:34:15]

The patchset sent to the CQ was uploaded after l-g-t-m from pthatcher@webrtc.org
Link to the patchset: https://codereview.webrtc.org/2590753002/#ps60001 (title:
"Fixing null pointer deref.")

[commit-bot: I haz the power, 2016-12-21 01:34:21]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.webrtc.org/...

[commit-bot: I haz the power, 2016-12-21 01:56:17]

CQ is committing da patch.

Bot data: {"patchset_id": 60001, "attempt_start_ts": 1482284054792650,
"parent_rev": "66f6c7207ced1dcb9fa1b1770305a4a4c6e660bb", "commit_rev":
"fe4a8a41adf704485b6f3bad4660fb56b58c7868"}

[commit-bot: I haz the power, 2016-12-21 01:56:19]

Description was changed from

==========
Implement current/pending session description methods.

BUG=webrtc:6917
==========

to

==========
Implement current/pending session description methods.

BUG=webrtc:6917

Review-Url: https://codereview.webrtc.org/2590753002
Cr-Commit-Position: refs/heads/master@{#15722}
Committed:
https://chromium.googlesource.com/external/webrtc/+/fe4a8a41adf704485b6f3bad4...
==========

[commit-bot: I haz the power, 2016-12-21 01:56:20]

Committed patchset #4 (id:60001) as
https://chromium.googlesource.com/external/webrtc/+/fe4a8a41adf704485b6f3bad4...