0e27e0fc38
This is the first step in making Flutter aware of and responsive to Z bound overflow. On its own this patch shouldn't result in any changes in behavior. This will need to be followed up with a patch in Fuchsia's Flutter runner to set the Z bounds after this lands, and another patch in the engine actually implementing the desired overflow behavior. This Z bound info is routed through the engine itself to make sure the bounds in flow are truly consistent from the Fuchsia runner. However these values should eventually be exposed to the framework as well.
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