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Previously, we always anchored to the primary display.

Now, we'll check for where new windows will be opened. We match a
display against the bounds for that window and anchor there.

Bug: b:111445270
Change-Id: Ice37359fe61937d452d7a908a609d1b60d913a37
Reviewed-on: https://chromium-review.googlesource.com/1150920
Commit-Queue: David Black <dmblack@google.com>
Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Reviewed-by: Xiaohui Chen <xiaohuic@chromium.org>
Cr-Commit-Position: refs/heads/master@{#582247}