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If the current video stream is encrypted, set PROTECTED_VIDEO in the
decoded video frame.

Notes:
- clear leads in an encrypted video stream also have PROTECTED_VIDEO set
- For clear stream, even though we are using the CDM to decode it,
  PROTECTED_VIDEO will NOT be set

Bug: 849464
Change-Id: Iae3257aaa122af8073f815278d8b65b55946f3f3
Reviewed-on: https://chromium-review.googlesource.com/c/1337486
Commit-Queue: Xiaohan Wang <xhwang@chromium.org>
Reviewed-by: John Rummell <jrummell@chromium.org>
Reviewed-by: Maggie Chen <magchen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#609851}