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Fix an out-of-bound memory access bug in unit tests.

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
TEST=Run capture_unittests on host with asan and lsan build
TBR=wuchengli@chromium.org,emircan@chromium.org

Change-Id: Ieafc98e07bbc39ac64347eea76baa3a496c0c775
Reviewed-on: https://chromium-review.googlesource.com/1059915Reviewed-by: Ricky Liang <jcliang@chromium.org>
Commit-Queue: Ricky Liang <jcliang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#558770}