Relanding PacketOptions enabling CL https://codereview.chromium.org/177603002
after libjingle roll r5619.

This CL was reverted earlier due to ASAN LKGR bot break (https://codereview.chromium.org/177603002).

TBR=sergeyu@chromium.org
TBR=cevans@chromium.org,avi@chromium.org

Review URL: https://codereview.chromium.org/184813006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@254402 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 254402