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We got 1 crash dump for NV12 and 3 for YUY2 all of which are due to OOM.
NV12 failures in UMA seem to be from older clients before the fix for
odd dimensions went in.  Filtering UMA to recent versions shows that
there are no NV12 swap chain creation failures.

Also change default swap chain format to NV12 when overlays are enabled
using command line flags.

Bug: 869677
Change-Id: If847f1d0a6121df27445b99e3bcb62290b3ed5df
Reviewed-on: https://chromium-review.googlesource.com/c/1355616Reviewed-by: Zhenyao Mo <zmo@chromium.org>
Commit-Queue: Sunny Sachanandani <sunnyps@chromium.org>
Cr-Commit-Position: refs/heads/master@{#612465}