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Address the performance of platform view due to an extra overlay. This overlay was added due to the following rounding problem: > For example, if we interleave flutter widget and platform view in a list, and let's say we have a flutter widget (top = 0, bottom = 100.1), and a platform view below that widget (top = 100.1, bottom = 200). They are NOT supposed to be overlapping. However, after rounding out, we will get flutter widget (top = 0, bottom = 101), and platform view (top = 100, bottom 200). This will result in 1 pixel overlap as long as there's a floating point in the coord. (Quote myself from the discussion below). *List which issues are fixed by this PR. You must list at least one issue.* Fixes https://github.com/flutter/flutter/issues/143420 *If you had to change anything in the [flutter/tests] repo, include a link to the migration guide as per the [breaking change policy].* [C++, Objective-C, Java style guides]: https://github.com/flutter/engine/blob/main/CONTRIBUTING.md#style