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This small CL introduces an addition to the SharedImageUsage enum:
SHARED_IMAGE_USAGE_NATIVE_BUFFER. It will be used
in the shared image factory to determine the correct type of factory
(interop_backing_factory) to be used for platform specific tasks such
as VA-API decoding on Chrome OS.

The goal of this new usage is that on Chrome OS, a SharedImage created
using SHARED_IMAGE_USAGE_NATIVE_BUFFER should have an underlying
buffer and representations suitable for working with a video
acceleration API. In the case of VA-API, this means the underlying
buffer should be a NativePixmap.

Separate CL:
https://chromium-review.googlesource.com/c/chromium/src/+/2083662

BUG=1058103
TEST=None

Change-Id: I7159163b5cc276f9ea4f6d5a6c0835b66bd72c89
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2089951
Commit-Queue: Paulo Warren <pwarren@chromium.org>
Reviewed-by: Khushal <khushalsagar@chromium.org>
Reviewed-by: Andres Calderon Jaramillo <andrescj@chromium.org>
Cr-Commit-Position: refs/heads/master@{#749197}