David Worsham cb0aca7f74 Wire up Opacity on Fuchsia, round 2 (flutter/engine#14024)
* Remove erroneous ChildView opacity

* Wire frame metrics through contexts

* Maintain layer stack inside of SceneBuilder

* Remove EnsureSingleChild

* Centralize system-composite and elevation logic

* Wire up OpacityLayer to Scenic
2019-12-04 19:29:31 -08:00
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