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When the user changes focus between custom margins inputs, this causes
the preview area to scroll, which should not occur since the iframe
containing the plugin is in a fixed location. Work around this issue
in the same way as in the old UI: manually set the offsets of the
preview area element to 0.

This workaround has the downside that the newly focused input is not
visible to the user, and therefore key events cause another scroll,
which is not addressed by the workaround. To address this issue, after
setting the offsets, inform the plugin that it should scroll to make
the input visible.

Bug: 901777
Change-Id: If310b84229fd53ffaee449699b8ac8a13806101c
Reviewed-on: https://chromium-review.googlesource.com/c/1351950Reviewed-by: Demetrios Papadopoulos <dpapad@chromium.org>
Commit-Queue: Rebekah Potter <rbpotter@chromium.org>
Cr-Commit-Position: refs/heads/master@{#612506}