LayoutTests/imported/w3c/web-platform-tests/user-timing/clear_all_measures.any.js

test(function()
{
    self.performance.mark("mark1", "responseStart");
    self.performance.measure("measure1", "mark1");
    self.performance.mark("mark2", "responseStart");
    self.performance.measure("measure2", "mark2");

    // test that two measures have been created
    var entries = self.performance.getEntriesByType("measure");
    assert_equals(entries.length, 2, "Two measures have been created for this test.");

    // clear all measures
    self.performance.clearMeasures();

    // test that all measures were cleared
    entries = self.performance.getEntriesByType("measure");
    assert_equals(entries.length, 0,
              "After a call to self.performance.clearMeasures(), " +
              "self.performance.getEntriesByType(\"measure\") returns an empty object.");

}, "Clearing all marks remove all of them.");