GitLab

|swap_chain_format_| should be initialized to prevent crashes when
calling strlen() on the return value DxgiFormatToString().  Initializing
to BGRA matches the behavior prior to adding |swap_chain_format_|.  Also
guard against such crashes by returning a valid string instead of
nullptr from DxgiFormatToString().

Bug: 1129031
Change-Id: I113bca2b7a5899dc270f97089f94c6222b2a71cc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2414654Reviewed-by: Zhenyao Mo <zmo@chromium.org>
Commit-Queue: Zhenyao Mo <zmo@chromium.org>
Commit-Queue: Sunny Sachanandani <sunnyps@chromium.org>
Auto-Submit: Sunny Sachanandani <sunnyps@chromium.org>
Cr-Commit-Position: refs/heads/master@{#807637}