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This API allows mojom::VideoDecoder clients to get a list of rules that
can be used to reject unsupported Initialize() calls without additional
IPC.

On the GPU side, this information is gathered from the existing VDA
SupportedProfiles factory.

On the renderer side, GpuVideoAcceleratorFactories is now responsible
for this query, which it does upon construction. If a MojoVideoDecoder
is initialized before the query has completed, MojoVideoDecoder will
call the remote Intitialize() method as normal.

Bug: 839951, 522298
Change-Id: I62b1e2f6ad79f096d273d7591da1e98094b9cbfe
Reviewed-on: https://chromium-review.googlesource.com/1066620Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Commit-Queue: Dan Sanders <sandersd@chromium.org>
Cr-Commit-Position: refs/heads/master@{#593327}