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This CL moves the conversion from premul alpha bitmap to unpremul into
SkBitmapTocursorImage(), instead of the caller. This wasn't being used
in Aura/X11 but present in Ozone/X11.

Also change the input parameter to a const reference.

Change-Id: I1768643e45472735e5ad7886b61f4443f8b74876
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2167276Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Henrique Ferreiro <hferreiro@igalia.com>
Cr-Commit-Position: refs/heads/master@{#763585}