Adjust bubble size in response to screen configuration change.

As a known issue, this doesn't respond to turning on/off the docked
magnifier.

Test: manually verified by rotating screen and zooming by ctrl-shift-+.
Bug: 862575
Change-Id: I7e74b4ce701c017b77df59cce00a30b0c3ebc821
Reviewed-on: https://chromium-review.googlesource.com/1134633
Reviewed-by: Yoshiki Iguchi <yoshiki@chromium.org>
Commit-Queue: Tatsuhisa Yamaguchi <yamaguchi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#575944}
2 files changed