WIP: Fred/layer raster cache bugfix

[fredlee12345678]

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[flar]

Some code complexity could be reduced by putting the flag in the context so that only layers that care about the condition will need to be modified.

Also, an alternative could be to set the cull rect to kGiantRect in those layers that don't want their inherited culling rect to be passed on. This wouldn't require an additional flag.

[flar]

I have another fix for this issue being reviewed under #22336