Roll WebRTC from 1ae7fadf81dd to 1a99869d9e2a (3 revisions)

https://webrtc.googlesource.com/src.git/+log/1ae7fadf81dd..1a99869d9e2a

2025-10-09 herre@google.com Pass packet arrival timestamp to DatagramConnection observers
2025-10-09 brandtr@webrtc.org Implement `Assembler`.
2025-10-09 vardar@google.com Add a generic QP parser.

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/webrtc-chromium-autoroll
Please CC webrtc-chromium-sheriffs-robots@google.com,webrtc-infra@google.com on the revert to ensure that a human
is aware of the problem.

To file a bug in WebRTC: https://bugs.chromium.org/p/webrtc/issues/entry
To file a bug in Chromium: https://bugs.chromium.org/p/chromium/issues/entry

To report a problem with the AutoRoller itself, please file a bug:
https://issues.skia.org/issues/new?component=1389291&template=1850622

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+doc/main/autoroll/README.md

Bug: chromium:443019066
Tbr: webrtc-chromium-sheriffs-robots@google.com
Change-Id: I1bc018b540aeff11b77ee261c943916f5e8a3bb3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/7025357
Commit-Queue: chromium-autoroll <chromium-autoroll@skia-public.iam.gserviceaccount.com>
Bot-Commit: chromium-autoroll <chromium-autoroll@skia-public.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/main@{#1527519}