If we manage to submit two raster frames in a single vsync, e.g. because we made a swap buffers call that took an unexpectedly long time and pushed us into the next frame boundary, we can use this extension to let SurfaceFlinger know to only actually render the latest frame.

This should help save GPU time and make sure we don't get ahead of the GPU in the case where we're able to rapidly pump frames.

see https://android.googlesource.com/platform/frameworks/native/+/master/opengl/specs/EGL_ANDROID_presentation_time.txt

/cc @ds84182 @blasten @chinmaygarde