[libjingle_xmpp] Add fuzzer for xml parsing.

Bug: 950091
Change-Id: Ia71b231c84e65ed223a125054993992917227e25
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1600397
Commit-Queue: Jonathan Metzman <metzman@chromium.org>
Auto-Submit: Jonathan Metzman <metzman@chromium.org>
Reviewed-by: Sergey Ulanov <sergeyu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#657777}
2 files changed