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The bug is that after two-finger tapping on an app icon in
the shelf, the shelf sometimes becomes unresponsive.

This was caused by logic that assumed we wanted to forward all
gesture events when the context menu was created with a gesture event.

This is fixed by adding a check to see if we are actually dragging
an app icon before asking MenuRunner to send events to owner.

TEST=manual

Bug: 794681
Change-Id: Ib2b764126874f9fd58578a1610a70e2c7881ff78
Reviewed-on: https://chromium-review.googlesource.com/828293
Commit-Queue: Alex Newcomer <newcomer@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#524502}