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This CL changes the call to vaCreateContext() to use a set of dummy
VASurfaceIDs and removes the then unnecessary parameter from CreateContext().

Bug: None
Change-Id: Ibe64deb21ff2f9fabf351740389a60eb44ff1636
Reviewed-on: https://chromium-review.googlesource.com/c/1351747
Commit-Queue: Hirokazu Honda <hiroh@chromium.org>
Reviewed-by: Hirokazu Honda <hiroh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#611983}