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Previously the only way to pin an unpinned open app in shelf is to use the context menu. In this update, we enable the feature that dragging an unpinned open app to the pinned app side is available to pin the app.

Bug: 1084856

Change-Id: I559a8967942a1c4d6ee7eb370cd81181b173c361
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2321065Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Reviewed-by: Toni Baržić <tbarzic@chromium.org>
Reviewed-by: Jenny Zhang <jennyz@chromium.org>
Commit-Queue: Wen-Chien Wang <wcwang@google.com>
Cr-Commit-Position: refs/heads/master@{#798198}