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Currently, when the keyboard is shown, we check if it obscures the
focused window. If it does, we move the focused window upwards so that
it's no longer obscured by the text field.

While this works well for the docked keyboard, it doesn't make much
sense for the floating keyboard. Thus, we change the logic to use
the occluded bounds of the keyboard to check whether it obscures the
focused window. The occluded bounds is the same as the actual bounds
for the docked keyboard, but is empty for the floating keyboard. This
means that the floating keyboard will no longer cause the focused
window to move upwards.

Bug: 838731
Change-Id: Id5de5c35980c69443be114631840bdfb64f26b3e
Reviewed-on: https://chromium-review.googlesource.com/1059976Reviewed-by: James Cook <jamescook@chromium.org>
Reviewed-by: Yuichiro Hanada <yhanada@chromium.org>
Commit-Queue: Darren Shen <shend@chromium.org>
Cr-Commit-Position: refs/heads/master@{#559336}