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When showing the system tray with the shortcut, the auto-hide shelf is
shown and the system tray gets the focus. Then tapping on the shelf
button will change the focus and system tray (including shelf)
is dismissed. The shelf button starts to handle the gesture event after
the shelf is closed. As a result, the shelf button does not respond to
gesture events.

In this CL, when a touch-pressing event comes and shelf is visible,
ShelfBezelEventHandler holds the shelf until the touch-releasing event
arrives. It is effective because ShelfBezelEventHandler receives the
event before SystemTrayEventFilter.

Bug: 902680
Change-Id: Id04780e2211c0ab19691db811496e703950f81d8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1639082Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Commit-Queue: Andrew Xu <andrewxu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#666302}