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This CL generalizes some functions in VaapiWrapper that will be shared
by all potential implementing classes of VaapiImageDecoder.

In addition, this CL refactors (cleans up) the way VaapiImageDecoder
initializes the VaapiWrapper member.

Bug: 877694
Test: jpeg_decode_accelerator_unittest
Change-Id: Ic1fe5a1c4a104ed1cf27533af65f811e7db5e534
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1660829Reviewed-by: Daniele Castagna <dcastagna@chromium.org>
Reviewed-by: Andres Calderon Jaramillo <andrescj@chromium.org>
Commit-Queue: Gil Dekel <gildekel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#669868}