Skip sending HWUI hints when frame does not draw

Sending HWUI ADPF CPU hints when the frame is not drawn can undercount
the actual workload duration and lead to inadequate boosting. This
patch prevents this by not sending hints when the frame is not drawn.

Bug: b/239677101
Test: manual
Change-Id: Ia308f59740c83977df02dff6d9f9289f2b8d439e