Roll src/third_party/libavif/src/ f48a33827..01ee4caa5 (77 commits)

https://chromium.googlesource.com/external/github.com/AOMediaCodec/libavif.git/+log/f48a33827db6..01ee4caa5ab5

$ git log f48a33827..01ee4caa5 --date=short --no-merges --format='%ad %ae %s'
2020-07-14 jdrago v0.8.0
2020-07-14 jdrago Update CHANGELOG
2020-07-14 jdrago Fix usages of rgb in README
2020-07-10 wtc Set encoder chroma sample position
2020-07-10 wtc avifenc: add --tilerowslog2 and --tilecolslog2
2020-07-10 jdrago Build nasm from source in GitHub the way it is built in Travis
2020-07-09 wtc Update avifBitsReadUleb128 with latest dav1d code
2020-07-09 wtc Do not set cfg.kf_mode = AOM_KF_DISABLED
2020-07-09 jdrago Remove monochrome from this new check
2020-07-09 jdrago Fix lossless monochrome checks; this needs another pass
(...)
2020-06-22 wtc avifImageRGBToYUV() cleanup
2020-06-22 jdrago Stub out a contrib directory for future PRs
2020-06-22 wtc Build LIB_FILENAME from CMake variables
2020-06-22 wtc avifRWStreamWriteFullBox() cleanup
2020-06-22 jdrago Avoid known crash in libaom's monochrome encoding, and simulate it with YUV420 as a fallback
2020-06-22 wtc Remove yShift out param from avifImageCalcAOMFmt()
2020-06-22 E.M.terHoeven Changelog.md: Add line for dav1d 0.7.1 update
2020-06-22 E.M.terHoeven Ext: Update to dav1d 0.7.1
2020-06-19 jdrago Partially fix my grammar in my run-on sentence
2020-06-19 jdrago Add some additional comments explaining the usage of ID 0 when calling avifDecoderDataFindMetadata()

Created with:
  roll-dep src/third_party/libavif/src
R=dalecurtis@chromium.org

Bug: 1105148
Change-Id: I79ff72c7533a2b6228336663388af997056eef41
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2300629Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Commit-Queue: Wan-Teh Chang <wtc@google.com>
Cr-Commit-Position: refs/heads/master@{#788854}

DEPS

@@ -346,7 +346,7 @@ vars = {
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling libavif
   # and whatever else without interference from each other.
-  'libavif_revision': 'f48a33827db60223753e637699cef24f034c547d',
+  'libavif_revision': '01ee4caa5ab52b2f6f3e500fd3a0f70e0099b031',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling nearby
   # and whatever else without interference from each other.