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Previously, with CL 2446353, the context menu was moved to be shown on
dragend and not drop. However, if the user moves their finger by a few
pixels but not enough for a index change, a drop event can occur before
a dragend event which finishes out the DragSession and therefore never
calls the dragend code that shows the context menu [1]. This CL
duplicates the context menu call to also happen on drop for these cases.

[1] https://source.chromium.org/chromium/chromium/src/+/master:chrome/browser/resources/tab_strip/drag_manager.js;l=574;drc=31eb3f4376c66b42eb4fc269025be4a8ee13e357;bpv=1

Bug: 1142608
Change-Id: Ic6daf3dfc38c945e45cf366baea7901ca645ff68
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2500482
Commit-Queue: John Lee <johntlee@chromium.org>
Reviewed-by: dpapad <dpapad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#821387}