camera_fixture: merge ALS test into camera_fixture.

camera_fixture now supports a new test type 'ALS' which performs ALS
calibration with ALSLightChamber.

BUG=chrome-os-partner:33611
TEST=set test_type to 'ALS' with mock_mode=True

Change-Id: Ie39d6cb6df9542f63531698cc7a72d6bb5a3d96b
Reviewed-on: https://chromium-review.googlesource.com/238645
Reviewed-by: Justin Chuang <jchuang@chromium.org>
Commit-Queue: Wei-Ning Huang <wnhuang@chromium.org>
Tested-by: Wei-Ning Huang <wnhuang@chromium.org>
9 files changed