The rasterization time metrics have regressed in various benchmarks.

See https://flutter-flutter-perf.skia.org/e/?begin=1639177151&end=1639424651&keys=Xb33025e8bac42440632fae83a9cc5ab2&num_commits=50&request_type=1&xbaroffset=26859

This started with the 3670926 engine roll.

Specifically the commit that enabled use of the eglPresentationTimeANDROID extension
(flutter/engine@5502a0a,
also see flutter/engine@88948de)

@dnfield @chinmaygarde @iskakaushik