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This feature is to allow the creation of NSWindows in the app shim
process instead of the Chrome browser process.

AppShim instances will inherit the behavior of whatever Chrome
instance they attach to.

If the Chrome instance has this feature enabled, then it will send
messages to the AppShim telling it to establish connections to
create windows.

Bug: 821651
Change-Id: Ieaef0f8c61fc93e6c187a8c5e4e21c9ff2a740eb
Reviewed-on: https://chromium-review.googlesource.com/965268
Commit-Queue: ccameron <ccameron@chromium.org>
Reviewed-by: Trent Apted <tapted@chromium.org>
Cr-Commit-Position: refs/heads/master@{#543856}