claincly f2a63e9ddf Fix availableFrameCount semantic
`availableFrameCount` tracks the number of frames that is avilable on the
`SurfaceTexture`, but haven't been used (by `updateTexImage()`) yet. Thus
semantically this counter should only be decremented after calling
`updateTexImage()`, not before it.

Also reworded `getPendingFrameCount()` javadoc, "external texture" is an
internal state that is not publicised anywhere.

PiperOrigin-RevId: 488765174
2022-11-16 12:43:49 +00:00
..
2022-11-16 12:43:49 +00:00