web-platform-tests/wpt merge_pr_47903

on GitHub

[wptrunner] Reland "Implement --leak-check for Blink-based browsers" (#47903)

This PR relands #47850 with two fixes:

• Introduce ProtocolPart.after_connect(), then fetch the initial leak
  counters there after the base protocol part is initialized. This
  avoids requiring base to be setup() before leak, which was true
  by happenstance.
• Tolerate ExecutorBrowser without leak_check, since some browsers
  that don't inherit from ChromeBrowser still use
  ChromeDriverProtocol sometimes (e.g., print-reftests for Chrome on
  Android). ChromeDriverProtocol still excludes its leak part
  altogether if leak_check=False to avoid running after_connect().