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This avoids the possible matrix mismatch between RasterCache::Get and RasterCacheResult::draw. See https://github.com/flutter/engine/pull/17790 for an example that tries to fix an earlier mismatch.
Flow
Flow is a simple compositor based on Skia that the Flutter engine uses to cache recoded paint commands and pixels generated from those recordings. Flow runs on the raster thread and uploads information to Skia.