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XEvent raw events are currently being "leaked" to views' DWTHX11 so that
they can be forwarded to ATK. This CL moves the platform specific part
of that process into platform_window level, which consists of
translating XEvent into AtkkeyEventStruct, and adds a callback into
PlatformWindowDelegateLinux to handle ATK key events, thus making it
more aligned with Ozone design and removing more platform specific code
from views.

Bug: 990756, 965991
Change-Id: I9a3ba12969dcd5582f79f118cc12879d55a56388
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1864783Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Nektarios Paisios <nektar@chromium.org>
Reviewed-by: Thomas Anderson <thomasanderson@chromium.org>
Commit-Queue: Nick Yamane <nickdiego@igalia.com>
Cr-Commit-Position: refs/heads/master@{#710118}