liyuqian 0e1cdfdcf5 Reland "Remove layer integral offset snapping" (flutter/engine#17915)
This reverts commit c72ff4a and relands #17712.

Fixes flutter/flutter#53288 and flutter/flutter#41654.

Together with #17791, this reland addresses some of Jim's concerns in the original PR #17712.

The major part of this PR is still the same as the original PR, and the performance / golden image impacts should be the same.
2020-05-01 15:01:42 -07:00
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