Roll src/third_party/webrtc fa068336f9e0..d2aa8f97f109 (2 commits)

https://webrtc.googlesource.com/src.git/+log/fa068336f9e0..d2aa8f97f109

git log fa068336f9e0..d2aa8f97f109 --date=short --first-parent --format='%ad %ae %s'
2020-03-31 marinaciocea@webrtc.org Insert audio frame transformer between encoder and packetizer.
2020-03-31 tommi@webrtc.org Reducing calls to clock_->TimeInXyz in RTCPReceiver.

Created with:
  gclient setdep -r src/third_party/webrtc@d2aa8f97f109

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/+/master/autoroll/README.md

Bug: None
Tbr: webrtc-chromium-sheriffs-robots@google.com
Change-Id: I4072dadf65b830cc8800268a5c1b9b1a7fe076ab
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2129767Reviewed-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@{#754907}

DEPS

@@ -1448,7 +1448,7 @@ deps = {
     Var('chromium_git') + '/external/github.com/gpuweb/cts.git' + '@' + '84ee597cdeae08bb26e578fc66a35bcf35f633f4',
 
   'src/third_party/webrtc':
-    Var('webrtc_git') + '/src.git' + '@' + 'fa068336f9e04dacb80eee6f19a77e60a5f32398',
+    Var('webrtc_git') + '/src.git' + '@' + 'd2aa8f97f1091f87561d5559a72c27ec73fa4cdb',
 
   'src/third_party/libgifcodec':
      Var('skia_git') + '/libgifcodec' + '@'+  Var('libgifcodec_revision'),