Account for child margin-top in getContentHeight()#21097

Merged

dreamofabear merged 3 commits intoampproject:masterfrom dreamofabear:content-height-top-gap

Feb 27, 2019

+54-25

Commits on Feb 26, 2019

Account for child margin-top in contentHeight calc.
William Chou
committed
Fix tests.
William Chou
committed
Add unit tests.
William Chou
committed