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The original CL is crrev.com/c/1291289. It was reverted due to crash.
Please see crbug.com/903671.

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, 903671
Test: Can type text on Wikipedia kiosk app.
Change-Id: I3e6457ee3dc5f3fdcca35a7acbb007325697ddbd
Reviewed-on: https://chromium-review.googlesource.com/c/1339779Reviewed-by: Yusuke Sato <yusukes@chromium.org>
Commit-Queue: Yuichiro Hanada <yhanada@chromium.org>
Cr-Commit-Position: refs/heads/master@{#609551}