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This splits apart the computation of each emulated field and makes more
clear the intended outcome for desktop vs mobile cases. We remove the
applied_widget_rect_ state, which can be computed from other inputs, and
the scale_ state which is already stored in the emulation_params_.

When the scale is not used, it used to store it as 0 and multiply the
context menu coordinates by 0. Now we store a 1 when the scale is not
used.

R=avi@chromium.org
TBR=caseq

Bug: 1006052
Change-Id: I9c9aabca73d7d73f946e5889444004e00e181bec
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1834080
Commit-Queue: danakj <danakj@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#702235}