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This CL consolidates some of the error types in VaapiImageDecodeStatus
in preperation for the implementation of VaapiWebPDecoder.
This CL also moves the protected members from VaapiImageDecoder to the
implementing subclasses. This is done to address a concern raised by
andrescj@ on a future CL.
See here:
https://crrev.com/c/1672404/5/media/gpu/vaapi/vaapi_image_decoder.cc#20

Bug: 877694
Test: jpeg_decode_accelerator_unittest
Change-Id: I2192ce81b3366a0e284a3f3c7bdac5c229bb0dff
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1673576
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@{#672597}