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Screen capture on protected videos will no longer work after software protected
videos are supported.

This CL handles YUVVideoDrawQuad only. The other part of the support on the gpu
side was checked in separately. The main change in this CL is to replace the
existing flag |is_protected_video| with |protected_video_type| which includes
clear, softwareProtected and hardwareProtected.

NOTE: Before this CL, |PROTECTED_VIDEO| means hardware protected video. After
this CL, |PROTECTED_VIDEO| means both software and hardware and |HW_PROTECTED|
will differentiate whether it's protected by software or hardware.

Bug:903552

Change-Id: I8c025bdcbafaed224a5e1f9ea6fa14b42bdfe192
Reviewed-on: https://chromium-review.googlesource.com/c/1334099Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Rintaro Kuroiwa <rkuroiwa@chromium.org>
Reviewed-by: Antoine Labour <piman@chromium.org>
Reviewed-by: Xiaohan Wang <xhwang@chromium.org>
Reviewed-by: Zhenyao Mo <zmo@chromium.org>
Commit-Queue: Maggie Chen <magchen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#609818}