Function runVsync

test/unit/test-viewport.js:151–161

()

  }

  function runVsync() {
    const tasks = vsyncTasks.slice(0);
    vsyncTasks = [];
    tasks.forEach(function (task) {
      const state = {};
      if (task.measure) {
        task.measure(state);
      }
      task.mutate(state);
    });
  }

  function stubVsyncMeasure() {
    env.sandbox