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Recent changes to pointer lock requests(https://crrev.com/c/2069199)
caused an error in logic which allowed requests made while not in focus
to be able to succeed. This meant that a request made while changing
focus would cause a strange state. I also added an earlier check for
focus so that we error out before reaching the browser.

Bug: 1068339
Change-Id: If706d2a693ca6a9aa2a8cf6c85ed622b429b97fc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2138501Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Ken Buchanan <kenrb@chromium.org>
Commit-Queue: James Hollyer <jameshollyer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#758382}