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There should be a 4-pixel padding between hotseat's end and edging
app icon. The padding is implemented via shelf view's
|app_icons_layout_offset_|. However, update on
|app_icons_layout_offset_| does not change the shelf view's layout
directly. As a result, the padding may be missing. This CL fixes such
an issue by refreshing the shelf view's layout right after value update.

Bug: 1017979
Change-Id: I0aceaf6a20331cfca410ad1b418b461ac9d60e90
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1809063Reviewed-by: Manu Cornet <manucornet@chromium.org>
Commit-Queue: Andrew Xu <andrewxu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#709491}