…125800)

flutter/engine@b4551c7...b0da68e

2023-05-01 [email protected] Reland image encoder (flutter/engine#41632)

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This is a reland of flutter#41368 with fix for transparent images and a unit
test to verify it.

Skia would like to remove `SkImageGenerator::MakeFromEncoded` and this
appears to be the only remaining usage. It appears to be easily swapped
out for the `SkImages::DeferredFromEncodedData`. (skbug.com/13052)

This also removes the use of the internal `SkCodecImageGenerator` for
the public `SkCodec` API (which the image generator had just been
deferring to anyway).

While unbreaking some unit tests, I made a few assertions easier to
debug and produce nicer error messages.

## Pre-launch Checklist

- [x] I read the [Contributor Guide] and followed the process outlined
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- [x] I read the [Tree Hygiene] wiki page, which explains my
responsibilities.
- [x] I read and followed the [Flutter Style Guide] and the [C++,
Objective-C, Java style guides].
- [x] I listed at least one issue that this PR fixes in the description
above.
- [x] I added new tests to check the change I am making or feature I am
adding, or Hixie said the PR is test-exempt. See [testing the engine]
for instructions on writing and running engine tests.
- [x] I updated/added relevant documentation (doc comments with `///`).
- [x] I signed the [CLA].
- [ ] All existing and new tests are passing.

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