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Previously RasterContextProvider kept raw pointers to
SharedImageInterface and ContextSupport interfaces. These pointers were
also passed to OutputMailbox instances, which may outlive the decoder.
There as nothing to guarantee that OutputMailbox doesn't outlive the
SharedImageInterface implementation. Updated the decoder to use a
ref-counted pointer to RasterContextProvider interface. This allows to
ensure that SharedImageInterface is not destroyed before the
OutputMailbox instances that depend on it.

Bug: 1133325
Change-Id: I60b664d89207535d968cf998488457c789c800c9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2441935Reviewed-by: Wez <wez@chromium.org>
Reviewed-by: Robert Kroeger <rjkroege@chromium.org>
Reviewed-by: Dan Sanders <sandersd@chromium.org>
Commit-Queue: Sergey Ulanov <sergeyu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#816848}