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Doing so for adding logging for Smart Selection http://crrev/c/720270.

We need to distinguish the showSelectionMenu() event to know if it
comes from selection expansion/reset/dragging etc.

Bug: 731644
Change-Id: I5d9e69c4fcecd60ed2e92268cd2f5c9b91bc5b28
Reviewed-on: https://chromium-review.googlesource.com/723784Reviewed-by: Nico Weber <thakis@chromium.org>
Reviewed-by: Changwan Ryu <changwan@chromium.org>
Reviewed-by: Chris Blume <cblume@chromium.org>
Reviewed-by: Bo <boliu@chromium.org>
Commit-Queue: Shimi Zhang <ctzsm@chromium.org>
Cr-Commit-Position: refs/heads/master@{#510208}