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This change refactors Output.format_ to take a parameters object. This
helps maintain code readability in instances where optional parameters
need to be passed in.

Change-Id: I3e24f9d809b745aaef1bef16d376a16c35742a89
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1820044
Commit-Queue: Akihiro Ota <akihiroota@chromium.org>
Reviewed-by: David Tseng <dtseng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#713265}