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When you long press an overview item in clamshell mode with only one
virtual desk, you shall be gracefully prevented from dragging it,
instead of getting a DCHECK failure.

Test: ash_unittests DesksTest.LongPressOverviewItemInClamshellModeWithOnlyOneVirtualDesk
Bug: 1020339
Change-Id: I9fc2a6f587fea8487f11819645e68dcb8bfa5cf9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1894531
Commit-Queue: Avery Musbach <amusbach@chromium.org>
Reviewed-by: Ahmed Fakhry <afakhry@chromium.org>
Cr-Commit-Position: refs/heads/master@{#711742}