flutter_flutter

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[HCPP] Clean up overlay layer when last frame had overlay content and current doesn't (#173881 )

Fixes https://github.com/flutter/flutter/issues/173635

My current understanding of the issue is that we are never pushing a new
empty frame for this layer, so the texture gets stuck as shown in the
bug. If we keep track of when we had content last frame, and don't in
the current frame, we can push a single empty frame for that layer when
needed.

See example in
https://github.com/flutter/flutter/issues/173635#issuecomment-3192787040

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Co-authored-by: Gray Mackall <mackall@google.com>