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This CL adds the function CreateContextAndScopedVASurface() to the
VaapiWrapper, which attempts to create a context and surface and return
a std::unique_ptr<ScopedVASurface> to the client.

This CL is needed for the following change: https://crrev.com/c/1672404

Bug: 868400, 980379
Test: jpeg_decode_accelerator_unittest
Change-Id: Ic98ec612aed7ae221698e42f5b77378bbb0fc26d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1693361
Commit-Queue: Gil Dekel <gildekel@chromium.org>
Reviewed-by: Miguel Casas <mcasas@chromium.org>
Reviewed-by: Andres Calderon Jaramillo <andrescj@chromium.org>
Cr-Commit-Position: refs/heads/master@{#675806}