Compare to how the mouse works on other platform and the old input on WebGL, the Y axis for mouse input is reversed from the other coordinates.
The effects of this issue are:
- the zero point is the top of the screen, instead of the bottom
- Scroll and movement direction is reversed

Repro:
1. Download package and project at: https://github.com/Unity-Technologies/InputSystem
2. Use Input test project (Assets -> QA -> Input_Test -> Scenes)
3. (Optional) Enter Playmode to see how the mouse coordinate works
4. Build and launch WebGL player, and observe the mouse position, scroll, delta value change as it moves around.

Actual: The Y Axis on WebGL for mouse coordinate is reversed.