web-platform-tests/wpt merge_pr_47850

on GitHub

[wptrunner] Implement --leak-check for Blink-based browsers (#47850)

... to support Chromium CI testing needs.

• Introduce LeakProtocolPart, an optional API that lets wptrunner
  check for leaks programmatically. The default implementation checks
  that navigating to about:blank after a test cleans up the DOM
  objects it created.
• For browsers that implement LeakProtocolPart, the base WebDriver
  executors run the leak check after each test and report the results as
  an extra test result field named leak_counters.
• Currently, the only implementers of LeakProtocolPart are
  ChromeDriver-based browsers, which use a nonstandard Chrome DevTools
  Protocol method 0 to count DOM objects. For those browsers, a leak
  is coerced to CRASH to report the result appropriately and induce a
  browser restart.

See Also: https://crbug.com/40887057