Provide option to print stdout/stderr during bisect
Provide option to print stdout/stderr during bisect

Sometimes we need to look at stdout/stderr to determine if a revision
is good (e.g. when bisecting crbug.com/566275).

Review URL: https://codereview.chromium.org/1514803003

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#365391}

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