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The pinned files section of holding space needs to paint to a layer to
avoid clipping the focus rings for holding space item views. That said,
it still needs to impose a clipping rect to avoid scrollview contents
being displayed outside of the scrollview viewport.

Bug: 1152948
Change-Id: Ia14ff0df7dc36650d573d1f9d79f73360c08178b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2589043Reviewed-by: Toni Baržić <tbarzic@chromium.org>
Commit-Queue: David Black <dmblack@google.com>
Cr-Commit-Position: refs/heads/master@{#836931}