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The cursor config controls the scale (additional factor influencing
how fast the cursor moves) and rotation of the cursor in ozone. Ash
was applying this, but in mus/mash we need the window-server to apply
it. This patch makes mus automatically apply the scale.

BUG=701068
TEST=covered by test

Change-Id: Ibb4fb3d4584bc23bd17e9f1b527857e27f0b6564
Reviewed-on: https://chromium-review.googlesource.com/572326Reviewed-by: Elliot Glaysher <erg@chromium.org>
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Commit-Queue: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#487164}