Reject the descriptions that attempt to change the order of m= sections
in current local description.

When setting the descriptions, the order of m= sections would be compared
against existing m= sections and an error would be returned if the order
doesn't match.

Previously reviewed on:


Change-Id: I577e3424830b0a4c5ecd5524923873e30ad23d43
Commit-Queue: Zhi Huang <>
Reviewed-by: Zhi Huang <>
Cr-Original-Commit-Position: refs/heads/master@{#19842}
Cr-Mirrored-Commit: 2a5e4268f821ef7e3a0fb59bc4d40b8af04ec4f9
4 files changed