A slow listener could cause a race in the NotifyHandler
where the single reference to the buffer to send would get
updated when it shouldn't have been.
Switch to a queue of available buffers to prevent this race.
Also, stop setting and clearing the observer reference and instead
incStrong/decStrong to mark temporary strong ownership without
colliding with other owners in flight.
Bug: 27097094
Change-Id: Iee647bfae8b80019b6d8290179eed3973230901f
- Rename to FrameMetrics to avoid collision with existing
android.view.FrameStats class
- Make FrameMetricsObserver implementation detail,
exposing FrameMetricsListener interface as public API
and wrapping in FrameStatsObserver to maintain state
- Remove dropped frame count call, in favor of passing as
parameter to callback method.
- Move away from raw timestamp access in favor of Metric IDs
which represent higher-level, more stable stages in a frame
lifecycle and match the categories exposed in the onscreen
bars.
- Support many-to-many Window<->FrameMetricsListener relationship
Change-Id: I00e741d664d4c868b1b6d0131a23f8316bd8c5c2
