Camera2: Add CPU/GPU overhead measurement to legacy mode

Dumps GL and CPU processing duration and frame timestamps to a file,
whenever the device is closed or the stream configuration is changed.

- Add PerfMeasurement class to legacy mode
- Wire up minimal usage to SurfaceTextureRenderer

Change-Id: Ic9d74ca26f706780b746175aa615c7aae4ae52e7
5 files changed