Merge 226767 "Do not transform scroll event ordinal values"

Merge 226767 "Do not transform scroll event ordinal values"

> Do not transform scroll event ordinal values
> 
> We don't need to transform scroll event ordinal values anymore as
> we now interpret them as DIPs across the whole stack. Otherwise,
> high-DPI devices (e.g. Pixel) would see the overscroll sensitivity
> downscaled by the device scale factor.
> 
> Contributed by sheckylin@chromium.org
> 
> BUG=300059
> TEST=Make sure it takes roughly the same distance to scroll on the
> touchpad to trigger the back/forward history navigation gesture on
> both Pixel and other low-res devices.
> 
> Review URL: https://codereview.chromium.org/25373005

TBR=sheckylin@chromium.org

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=228921

[benhenry, 2013-10-16 15:54:39]

Committed patchset #1 manually as r228921.