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This CL implements the TakePhoto() API for the Chrome OS camera HAL
VideoCaptureDevice, including the following features:

  - Full size still capture
  - Auto-focus, auto-exposure, and auto-white-balancing stabilization

BUG=chromium:832772
TEST=Run capture_unittests on DUT
TEST=Make sure TakePhoto() API works on
https://googlechrome.github.io/samples/image-capture/grab-frame-take-photo.html

Change-Id: I99e44087006cac28eac7e73c6764f522dac57cfa
Reviewed-on: https://chromium-review.googlesource.com/1018641Reviewed-by: Emircan Uysaler <emircan@chromium.org>
Reviewed-by: Wu-Cheng Li <wuchengli@chromium.org>
Commit-Queue: Ricky Liang <jcliang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#558603}