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The original CL broke the component build due to a typo in the export
macro. It should have been CAPTURE_EXPORT instead of MEDIA_EXPORT in
camera_3a_controller.h, and the functions in camera_metadata_utils.h
should be exported as well.

Original change's description --------------------------------------------------

media: implement TakePhoto in Chrome OS camera HAL VideoCaptureDevice

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
TBR=wuchengli@chromium.org,emircan@chromium.org

Change-Id: Ia44506b30315df2aaff9047ff725fff95d3ba118
Reviewed-on: https://chromium-review.googlesource.com/1058881
Commit-Queue: Ricky Liang <jcliang@chromium.org>
Reviewed-by: Ricky Liang <jcliang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#558649}