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This adds usage of the protected media VAAPI APIs to VaapiWrapper. This
is currently based on an upstream pull request located here:
https://github.com/intel/libva/pull/457

That pull request will be patched onto the ChromeOS version of libva
before this CL is merged.

BUG=b:153111783,b:155509236
TEST=Builds, protected playback works w/ full set of changes,
vaapi_unittest, also verified vaapi playback & vaapi_unittest on eve

Change-Id: Id086dd33d692b86d810ea56645a63fb977d6bfc7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2526171
Commit-Queue: Jeffrey Kardatzke <jkardatzke@google.com>
Reviewed-by: Jeffrey Kardatzke <jkardatzke@google.com>
Reviewed-by: J Kardatzke <jkardatzke@chromium.org>
Reviewed-by: Miguel Casas <mcasas@chromium.org>
Cr-Commit-Position: refs/heads/master@{#829034}