This is useful in various situations, for instance if the HAL
wants to change its compositing strategy.
Bug: 4488017
Change-Id: I5afc14e5917c6db7926d7417d48677d5aba50caa
- we now clear the framebuffer upon request from the HAL
- the HAL list size could get out of sync with reality
- there was also an issue where sometime we could run past the list
Change-Id: Ic3a34314aed24181f2d8cc787096af83c046ef27