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When relocating the pinned app across pages, a proxy image view is
created in ScrollableShelfView. The proxy image view has the identical
bounds with ShelfView::|drag_view_|. However, |drag_view_|'s bounds
are adjusted to fit into the targeting icon slot. It is why the
dragged icon may move under the finger by itself. To fix the issue,
the proxy image's bounds should rely on the mouse/gesture event's
location.

This CL also adds the animation to move the drag icon from event
location to the ideal place after drag ends.

Bug: 1031367
Change-Id: I539abc1b97e061a50c2a53b1cc6b784e78c14983
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1990565
Commit-Queue: Andrew Xu <andrewxu@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#729963}