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This conversion has a very large app_interface. This is mostly due to
the heavy use of mocking and swizzling these tests use to interface
with the iOS camera status.

This also moves the CameraState enum into a separate file and gn
target so it can be included in test-side processes.

Bug: 987646
Change-Id: I5755ee1861de3ba74b9594e2c528d234b85feca8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1879249
Commit-Queue: Robbie Gibson <rkgibson@google.com>
Reviewed-by: Stepan Khapugin <stkhapugin@chromium.org>
Reviewed-by: Eugene But <eugenebut@chromium.org>
Cr-Commit-Position: refs/heads/master@{#709876}