liyuqian 4436df105f Remove cull_rects_ from SceneBuilder (flutter/engine#6352)
Skia should already have such optimizations based on a much more
accurate clip stack. As we move to the retained rendering, SceneBuilder
would be much harder to maintain such cull_rects_ stack so let's just
remove them.

No significant performance change is measured locally on Moto G4 with
flutter_gallery transition perf test and complex_layout scroll perf
test.
2018-09-27 17:09:26 -07:00
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