The Load Timeline context menu appears to do nothing. It looks like the synthetic click on the hidden <input type="file"> is not working as intended. STEPS TO REPRODUCE: 1. Right click in Timeline Panel 2. Select menu option "Load Timeline data..." => Expected file input menu to drop down, instead nothing happened
Closing as invalid, as this bug pertains to the old inspector UI and/or its tests. Please file a new bug (https://www.webkit.org/new-inspector-bug) if the bug/feature/issue is still relevant to WebKit trunk.