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abcd
✂cd
✂️cd
abcd

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Suspected Commit
[Mac] Only enable the CFBundleBlocker in the browser process.
by rsesek
https://codereview.chromium.org/2199313002 (r409244)
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Revision         Result         N
chromium@409230  487.7 ± 10.01  5  good
chromium@409238  500.5 ± 27.23  8  good
chromium@409242  498.6 ± 10.54  8  good
chromium@409243  493.0 ± 14.19  8  good
chromium@409244  514.3 ± 9.126  8  bad   ⬅
chromium@409246  510.9 ± 9.077  8  bad

Debug
 Command: src/tools/perf/run_benchmark -v --browser=release --output-format=chartjson --upload-results --also-run-disabled-tests startup.warm.blank_page
Platform: mac_hdd_perf_bisect
    Test: startup.warm.blank_page
  Metric: open_tabs_time/open_tabs_time
     Job: https://chromeperf.appspot.com/buildbucket_job_status/9005160320731443728

If This Is Wrong
https://chromeperf.appspot.com/bad_bisect?try_job_id=5878870750789632