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There is an API change in this libavif update. avifDecoderParse() no
longer takes the image data as input. Instead, an avifIO object needs to
be associated with an avifDecoder, and the avifDecoder calls the read()
method of the avifIO object to read image data incrementally. Eventually
Chrome will use its custom avifIO implementation. For now just use the
built-in avifIO object that reads from a memory buffer.

https://chromium.googlesource.com/external/github.com/AOMediaCodec/libavif.git/+log/1d32f88ab33e..0265cd7a10d1

$ git log 1d32f88ab..0265cd7a1 --date=short --no-merges --format='%ad %ae %s'
2020-10-08 jdrago Add some clarifying comments to the avifDecodeSample struct
2020-10-08 wtc Declare the sizeHint field of avifIO as uint64_t
2020-10-08 wtc avifDecoderReadItem callers can rely on contract
2020-10-08 wtc Change prototypes of functions for memory avifIO
2020-10-08 wtc More cleanup for avifDecoderReadItem()
2020-10-08 wtc Compare frameIndex with INT_MAX before int cast
2020-09-23 wtc Check for avifImageRGBToYUV failures
2020-10-07 wtc Use CHECKERR in avifDecoderFindMetadata()
2020-10-08 wtc Rewrite a loop as a do-while loop
2020-10-08 wtc Miscellaneous comment fixes
(...)
2020-09-24 jdrago Reintroduce an important size check in avifROStreamReadBoxHeader()
2020-09-23 wtc Fix GCC -Wclobbered warnings
2020-09-23 derek.buitenhuis avifIO: Remove API functions that take FILE* arguments
2020-09-22 jdrago avifdec: Error out properly when RGB conversion fails
2020-09-22 dnovomesky Use new API in gdk-pixbuf loader
2020-09-21 jdrago Mark avifIOCreateTestReader as static
2020-09-21 jdrago avifenc: Allow the setting/overriding of XMP, Exif, and ICC profiles
2020-09-21 jdrago Move Exif and XMP metadata (if present) to the front of the mdat for streaming considerations
2020-09-21 jdrago Rename sizeLimit to sizeHint, it better matches the comment and conveys its optional nature
2020-09-21 jdrago avifIO reader API

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

Bug: 1136922
Change-Id: I53e9600ec3650aa59212483e3281c9765b935533
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2462936Reviewed-by: Peter Kasting <pkasting@chromium.org>
Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Commit-Queue: Peter Kasting <pkasting@chromium.org>
Cr-Commit-Position: refs/heads/master@{#816390}