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Fixes for reland number 6:
- "Win10 Tester" capture_unittests failure
- "Win8 Tester" capture_unittests failure

Fixes for reland number 5:
- "Win10 Tester" browser_tests_functional failure
- "Win8 Tester" browser_tests_functional failure

Fixes for reland number 4:
- "Win10 Tester" browser_tests_functional failure
- "Win8 Tester" browser_tests_functional failure
- "Win8 Tester" capture_unittests failure

Fixes for reland number 3:
- "Win10 Tester" browser_tests_functional failure
- "Win10 Tester" capture_unittests failure
- "Win8 Tester" browser_tests_functional failure
- "Win8 Tester" capture_unittests failure

Fixes for reland number 2:
- "Win10 Tester" browser_tests_functional failure
- "Win10 Tester" capture_unittests failure
- "Win8 Tester" browser_tests_functional failure
- "Win8 Tester" capture_unittests failure

Fixes for reland number 1:
- "Win8 Tester" browser_tests_functional failure
- "Win8 Tester" capture_unittests failure

Original description:
- Full rewrite of the MediaFoundation implementation video part to use
IMFCaptureEngine
- Implementation of takePhoto, setPhotoOptions and getPhotoCapabilities
- takePhoto triggers a still image capture with the highest available
resolution without stopping the video stream thanks to IMFCaptureEngine

TEST=adapted video_capture_device_unittest.cc and
webrtc_image_capture_browsertest.cc; launch Chrome with
--force-mediafoundation on Win8+ and capture video using
e.g. https://webrtc.github.io/samples/src/content/getusermedia/gum/

R=mcasas@chromium.org

Bug: 730068
Change-Id: I7b7ff88f2db8d71f46428a2ecbb733e18a25a334
Reviewed-on: https://chromium-review.googlesource.com/734042
Commit-Queue: Christian Fremerey <chfremer@chromium.org>
Reviewed-by: Miguel Casas <mcasas@chromium.org>
Reviewed-by: Christian Fremerey <chfremer@chromium.org>
Cr-Original-Original-Original-Original-Original-Commit-Position: refs/heads/master@{#521435}
Reviewed-on: https://chromium-review.googlesource.com/810766
Cr-Original-Original-Original-Original-Commit-Position: refs/heads/master@{#524417}
Reviewed-on: https://chromium-review.googlesource.com/843974
Cr-Original-Original-Original-Commit-Position: refs/heads/master@{#527139}
Reviewed-on: https://chromium-review.googlesource.com/852455
Commit-Queue: Miguel Casas <mcasas@chromium.org>
Cr-Original-Original-Commit-Position: refs/heads/master@{#528005}
Reviewed-on: https://chromium-review.googlesource.com/858138
Cr-Original-Commit-Position: refs/heads/master@{#531109}
Reviewed-on: https://chromium-review.googlesource.com/885815
Cr-Commit-Position: refs/heads/master@{#532040}