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d0dc9b94d4
At a quick glance, one could easily think of the "engine_time" as the GPU thread time and the "frame_time" as the UI thread time because the GPU thread time is mainly spent on the engine while the UI thread time is mainly spent on the Dart framework to generate the frame. But it's actually the other way. The "engine_time" is UI thread time and the "frame_time" is the GPU thread time. To avoid the confusion, rename them to "ui_time" and "raster_time" respectively. I avoided the "gpu_time" because the rasterization may be purely on a CPU backed software Skia backend.
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.