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Move size calculation of oobe-adaptive-dialog to C++ which enables
better fit for on-login OOBE dialog and unifying sizes between
fullscreen and on-login screen versions.

Recalculate all of the needed CSS vars based on dialog size.
Since the dialog is centered no need to provide paddings around dialog
for fullscreen OOBE.

Bug: 1151292
Change-Id: Icd6fad02255abf105c940ad610caad5b578c06ad
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2567008Reviewed-by: Denis Kuznetsov [CET] <antrim@chromium.org>
Reviewed-by: Roman Sorokin [CET] <rsorokin@chromium.org>
Commit-Queue: Roman Aleksandrov <raleksandrov@google.com>
Cr-Commit-Position: refs/heads/master@{#837100}