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It's left as unimplemented because Android WM handles insets by VK for
most cases.
However, Android WM can't move the SystemTray up for inline-reply in an
Android notification because from Android WM's point of view,
notificaiton is placed at (0, 0).
This CL implements ArcImeService::EnsureCaretNotInRect to cover that
case.
This CL changes the behavior of windowed Android app with a11y keyboard.
Before this CL, a position of a window is not changed by a11y keyboard
visibility, but after this CL a position can be changed not to be
covered by a11y keyboard.

      SystemTray moves up if there is a space for it.

Bug: b/114115612
Test: manual - Focus on inline reply of an Android notificatioln and
Change-Id: Ib666b6c269a8fc36195d30affa4c7a8a805560d7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1631859Reviewed-by: Sadrul Chowdhury <sadrul@chromium.org>
Reviewed-by: Tetsui Ohkubo <tetsui@chromium.org>
Commit-Queue: Yuichiro Hanada <yhanada@chromium.org>
Cr-Commit-Position: refs/heads/master@{#664583}