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We should always allocate a new viz::LocalSurfaceId on auto-resize.

We no longer require a non-empty viewport along with a valid
viz::LocalSurfaceId, and so we can simplify the code here a bit.

Bug: 672962
Change-Id: Ic0c121815e869fc26cf4ba20ff218b52ec445fd3
Reviewed-on: https://chromium-review.googlesource.com/1026792Reviewed-by: Saman Sami <samans@chromium.org>
Commit-Queue: Fady Samuel <fsamuel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#553576}