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f20b17a2ae
The size of the LTO build of the engine with the dylib compressed is as follows: ```sh $ du -k libFlutter* 5236 libFlutter.dylib.tar.gz 4324 libFlutterSlimpeller.dylib.tar.gz ``` Sizes are in KiB. This represents a binary size reduction of 17.41% of the compressed artifacts. The compression ratios will likely differ based on the compression scheme. Uncompressed, the sizes are: ```sh $ du -k libFlutter* 16920 libFlutter.dylib 14044 libFlutterSlimpeller.dylib ``` This represents a binary size reduction of 16.99% which is in the same ballpark. The really mucky bit was backing out the raster cache and persistent cache. I want to clean that up in a later patch so that those TUs are part of a separate submodule. Opting out of Impeller will lead to a fatal log at startup saying the opt-out is disallowed. Fixes https://github.com/flutter/flutter/issues/126606
Flow
Flow is a simple compositor based on Skia that the Flutter engine uses to cache recorded paint commands and pixels generated from those recordings. Flow runs on the raster thread and uploads information to Skia.