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Scrollable shelf updates its layout when a shelf icon is added to
shelf view as a child. When an external display is connected, shelf
view of the external display should add shelf icons during shelf view
initialization. However, ShelfView::Init is called before shelf view
becomes the grand child of ScrollableShelfView. As a result,
scrollable shelf cannot perceive the change in view hierarchy.

This CL makes the initialization of shelf view be the last step of
ScrollableShelfView::Init. It also fixes the side effect brought by
reordering of child views' initialization.

Bug: 1035596
Change-Id: Ice08606d34b5af725157602c0038d995df2d36ab
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1984725
Commit-Queue: Andrew Xu <andrewxu@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#728252}