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the viz::FrameSinkId is not used when mus is hosting viz (the
current code DCHECKs in mus as we end up supplying an invalid
FrameSinkId, which triggers a DCHECK). To address this address a
struct with param traits to ensure the FrameSinkId is set when
appropriate.

BUG=804508
TEST=covered by tests

Change-Id: I1949d546d7aa7db39dc0ad2116694b614b3b875f
Reviewed-on: https://chromium-review.googlesource.com/887619
Commit-Queue: Scott Violet <sky@chromium.org>
Reviewed-by: Jonathan Ross <jonross@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#532245}