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Mac doesn't |use-zoom-for-dsf|. Hence, the ScreenSpaceTransform needs
to be scaled down by the device_scale_factor for hit testing to work
as intended.

Bug: 1003576
Change-Id: I049e5d06d4ed6859e3e5a88b7fb61b46e8175801
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1588948Reviewed-by: Jonathan Ross <jonross@chromium.org>
Reviewed-by: David Bokan <bokan@chromium.org>
Commit-Queue: Rahul Arakeri <arakeri@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#702546}