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Previously, we're also counting the pictures that are already raster cached. This fixes https://github.com/flutter/flutter/issues/44252 and helps solving the GPU thread issue of https://github.com/flutter/flutter/issues/43083 https://github.com/flutter/flutter/pull/45050 is a performance test in the framework repo to reveal this bug.
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 GPU thread and uploads information to the GPU.