Replace IMFTransform with ID3D11VideoProcessor

As far as I can tell, ID3D11VideoProcessor is the only one that understands
how to convert HDR10 content into scRGB textures. A future change will enable
use of this in order to properly decode HDR content.

BUG=682416
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel

Review-Url: https://codereview.chromium.org/2696963002
Cr-Commit-Position: refs/heads/master@{#451192}
4 files changed