FrameTimeManager gpuFrameTime is much lower when using Optimized Frame Pacing

Steps to reproduce:

1. Set up a Unity Android project with GLES.
2. Attach a script that uses Application.targetFramerate to target the max framerate and use FrameTiming.gpuFrameTime to log the "GPU Time" every frame
3. Run this test on your Android device with "Optimized Frame Pacing" enabled and disabled and compare results 

Actual results: Both test runs have similar results for GPU time

Expected results: The test run with Optimized Frame Pacing enabled shows frame time to be much lower. (e.g. 8ms vs 2ms).

Reproducible with versions: 2022.3.x, 2023.2.x, 2023.3.0b9

Not reproducible with versions: 2021.3.36f1

Can’t test with versions: 

Tested on (OS): 

Notes:

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