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Previously FuchsiaVideoDecoder wasn't using protected memory even when
decoding protected content. Now it will use protected IO buffers for
protected content when protected graphics is enabled. Also added
force-protected-video flag in web_engine_config, which allows to
force protected buffers for video output buffers for all content.

Bug: 1014835
Change-Id: Id02bf310804ea05dea2deae7aa5ec47aa6010926
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1910283
Commit-Queue: Sergey Ulanov <sergeyu@chromium.org>
Reviewed-by: David Dorwin <ddorwin@chromium.org>
Reviewed-by: Xiaohan Wang <xhwang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#714785}