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The design spec states tray bubble should be anchored to:
- right-bottom (when the shelf is positioned to the bottom or right)
- or left-bottom (when the shelf is positioned to the left)
corner of the workspace.

The bubble went to wrong positions when changing the device mode
between tablet and laptop, or rotating the screen, while the system
tray bubble is opened. This change is a fix for it.


Bug: 864939, 812536
Change-Id: I1392a2d96c72e06c4e8e159f22901720da72747a
Reviewed-on: https://chromium-review.googlesource.com/1246082
Commit-Queue: Tatsuhisa Yamaguchi <yamaguchi@chromium.org>
Reviewed-by: Yoshiki Iguchi <yoshiki@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#594630}