Amir Hardon a6be960c2f Make the virtual display's window translucent (flutter/engine#9828)
By default alpha is not preserved for the VD's contents.
We make the window translucent as a side effect of doing so is preserving alpha.
There should not be extra performance cost for setting the window to be translucent as there is only a single window within the VD.

Fixes flutter/flutter#33756
2019-07-15 16:51:36 -07:00
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