fix strange space at the top when FlexWrap (#522)#530

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sheckspir wants to merge 3 commits intogoogle:mainfrom sheckspir:bf_522

+202-11

Commits on Jan 15, 2020

fix strange space at the top when FlexWrap (google#522 )
sheckspir
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Commits on Jan 18, 2020

Merge remote-tracking branch 'google/master' into bf_522
sheckspir
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Commits on Jan 22, 2020

special using of orientationHelper for NOWRAP flexWrap. Add some tests (google#522 )
sheckspir
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