Jim Graham 5d22912344 DisplayList tracks maximum render op depths (flutter/engine#52070)
The DisplayList will now track the "render depth" of all rendering ops and provide the total content depth for DisplayList and save[Layer]/restore pairs to enable depth clipping in the back ends.

The depth accounting process is described in the class comment for `DlOpReceiver`
2024-04-17 23:13:28 +00:00
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