Incorrect time data is shown in the lower part's toolbar of the Profiler window: GPU:0.00ms is shown always despite of the actual time data values

1. Open Unity editor
2. Create a new project
3. Go to Window -> Profiler
4. In the Profiler window select Add Profiler -> GPU
5. Enter Play mode

Actual result: "GPU: 0.00ms" is shown on the lower pane
Expected result: Correct time data is shown

Reproducible with: 2017.3.0a5, 2017.3.0a6, 2017.3.0b1, 2017.3.0b8, 2018.1.0a1, 2018.1.0a4
Not reproducible with: 5.6.4f1, 2017.1.0f1, 2017.2.0f1, 2017.3.0a1, 2017.3.0a4
Regression first introduced in: 2017.3.0a5