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We changed IsInArcAppWindow() to use the window property,
aura::client::kAppType, but it's not set for ARC++ Kiosk apps' window.
It makes text input on ARC++ Kiosk apps stop working.
This CL adds a temporary workaround for this situation. Ideally,
IsArcAppWindow() in arc_util.cc should handle windows of ARC++ Kiosk app
correctly.

Bug: 891825
Test: Can type text on Wikipedia kiosk app.
Change-Id: I594aa5c0730704b9ad922441187297bd707de20a
Reviewed-on: https://chromium-review.googlesource.com/c/1291289
Commit-Queue: Yusuke Sato <yusukes@chromium.org>
Reviewed-by: Yusuke Sato <yusukes@chromium.org>
Cr-Commit-Position: refs/heads/master@{#601631}