Roll src/third_party/libvpx/source/libvpx/ c62d9d568..18d260d13 (3 commits)

https://chromium.googlesource.com/webm/libvpx.git/+log/c62d9d568fc6..18d260d13f2b

$ git log c62d9d568..18d260d13 --date=short --no-merges --format='%ad %ae %s'
2018-12-13 marpan vp8-mfqe: Increase initial frame# threshold
2018-12-13 marpan vp9-svc: On scene change: only reset TL in flexible mode.
2018-12-13 jingning Make the use of tpl model controlled by the encoder params

Created with:
  roll-dep src/third_party/libvpx/source/libvpx
R=johannkoenig@google.com

Change-Id: I2a449f99dfe6464e945a20b45354cf21e6db389a
Reviewed-on: https://chromium-review.googlesource.com/c/1377728
Reviewed-by: Tom Finegan <tomfinegan@chromium.org>
Commit-Queue: Marco Paniconi <marpan@google.com>
Cr-Commit-Position: refs/heads/master@{#616601}
3 files changed