Roll WebRTC from e4fd1ba31989 to 11215febb950 (3 revisions)

https://webrtc.googlesource.com/src.git/+log/e4fd1ba31989..11215febb950

2021-01-22 danilchap@webrtc.org Require scalability mode to initialize av1 encoder.
2021-01-22 webrtc-version-updater@webrtc-ci.iam.gserviceaccount.com Update WebRTC code version (2021-01-22T04:03:26).
2021-01-21 titovartem@webrtc.org Introduce network emulated endpoint optional name for better logging

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 on the revert to ensure that a human
is aware of the problem.

To report a problem with the AutoRoller itself, please file a bug:
https://bugs.chromium.org/p/skia/issues/entry?template=Autoroller+Bug

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

Bug: None
Tbr: webrtc-chromium-sheriffs-robots@google.com
Change-Id: I7c70dcb7fa26669d42cd593e8aa88b196c243ec1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2643133Reviewed-by: chromium-autoroll <chromium-autoroll@skia-public.iam.gserviceaccount.com>
Commit-Queue: chromium-autoroll <chromium-autoroll@skia-public.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/master@{#846096}

DEPS

@@ -1504,7 +1504,7 @@ deps = {
     Var('chromium_git') + '/external/github.com/gpuweb/cts.git' + '@' + '66460536ee975a3e98931b7b40a661a63fd9cd57',
 
   'src/third_party/webrtc':
-    Var('webrtc_git') + '/src.git' + '@' + 'e4fd1ba3198932d4c4ca0e0cc98635758555adee',
+    Var('webrtc_git') + '/src.git' + '@' + '11215febb9500c597c940a40f1b9fe86c939413f',
 
   'src/third_party/libgifcodec':
      Var('skia_git') + '/libgifcodec' + '@'+  Var('libgifcodec_revision'),