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With this change, I've added a media feature that returns true when
in immersive mode (eg, in VR). I've added extra plumbing to ensure that
this new feature is not web exposed.

More info on media features here:
https://www.w3.org/TR/css3-mediaqueries/#media1

The plumbing for this particular feature is very close to the plumbing
for -webkit-transform-3d.

I've also changed the "page popups suppressed" setting (which was only
ever true in immersive mode) to be named immersive, accordingly.
However, the uses of the immersive mode setting for suppressing page
popups are meant to be temporary, so I've added comments referencing
the bug that explains the removals.

Bug: 809021
Cq-Include-Trybots: master.tryserver.chromium.android:android_optional_gpu_tests_rel;master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.linux:linux_vr;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel
Change-Id: Ib46237b7c7f518830d0134c51baefeb3a1d89c11
Reviewed-on: https://chromium-review.googlesource.com/901484Reviewed-by: Rick Byers <rbyers@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Reviewed-by: Ken Buchanan <kenrb@chromium.org>
Commit-Queue: Ian Vollick <vollick@chromium.org>
Cr-Commit-Position: refs/heads/master@{#534497}