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Starting ARC R, ARC natively supports display density. As a result, when
the client is ARC P, the bounds are always scaled by the default device
scale factor, and when the client is ARC R and later, the bounds are
always scaled by the screen scale of the display, which matches the
browser behavior.

This CL addresses the above change in accessibility layer.

AX-Relnotes: n/a. (a part of preparation for ARC R)
Bug: b:17251157
Test: manual. Open PlayStore and change scale factor by ctrl+shift+(+/-) with P and R.
Change-Id: Iae39adaed7b3fc7a00962edc9da617b89dea7202
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2540266
Commit-Queue: Hiroki Sato <hirokisato@chromium.org>
Reviewed-by: David Tseng <dtseng@chromium.org>
Reviewed-by: Sara Kato <sarakato@chromium.org>
Cr-Commit-Position: refs/heads/master@{#829057}