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The widget had no insets in which to display the shadow. In this change,
add insets to the widget, and ensure they are taken into account after
calculating the preferred layout for the autoclick menu view.

Bug: 966153
Change-Id: If43a4f3e91f20261195102018aad90c8427ac9a4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1636285Reviewed-by: Tetsui Ohkubo <tetsui@chromium.org>
Commit-Queue: Katie Dektar <katie@chromium.org>
Cr-Commit-Position: refs/heads/master@{#665947}