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This option has the same functionality as the flag "--build-summary-exclude-informative", except it is an option rather than a flag. This makes it possible to get both a "full" summary and a "semantic" summary by specifying both "--build-summary-output" and "--build-summary-output-semantic". The flag "--build-summary-exclude-informative" is kept around to ease in transitioning tools, but it is deprecated. R=brianwilkerson@google.com Review URL: https://codereview.chromium.org/2104003004 .