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This is a reland of 0908b290

Original change's description:
> Fix calculation of inner padding of OOBE dialog depending on outer margins
> 
> Bug: 1007294
> Change-Id: I99b7b3cc46e12c0fb060f76e086f5f31bd4cb812
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1865216
> Commit-Queue: Roman Sorokin [CET] <rsorokin@chromium.org>
> Auto-Submit: Denis Kuznetsov <antrim@chromium.org>
> Reviewed-by: Roman Sorokin [CET] <rsorokin@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#707055}

Bug: 1007294
Change-Id: Iba03d0ed0f931ed50ced79b30dea18735fb127f4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1868990Reviewed-by: Denis Kuznetsov <antrim@chromium.org>
Commit-Queue: Denis Kuznetsov <antrim@chromium.org>
Cr-Commit-Position: refs/heads/master@{#707541}