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Capture bar appears on the display with the mouse cursor. The other
displays are dimmed out. In fullscreen capture mode, users can move the
mouse to the other display to focus that display. In region capture
mode, moving the mouse to the other display does nothing, but pressing
the mouse on the display will focus that display.

Focusing a display will move the widgets and the layer owned by the
session to the display.

See videos in linked bug for demos.

Test: added test
Bug: 1133454
Change-Id: If237ca653736e94549d7005f09ecc9c8e94dc8c1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2440874
Commit-Queue: Sammie Quon <sammiequon@chromium.org>
Reviewed-by: Ahmed Fakhry <afakhry@chromium.org>
Cr-Commit-Position: refs/heads/master@{#817148}