Tests co-existence of multiple DevTools extensions

Started extension.
Running tests...
RUNNING TEST: extension_testCreatePanel
Panel created
{
    createStatusBarButton : <function>
    onHidden : {
        addListener : <function>
        removeListener : <function>
    }
    onSearch : {
        addListener : <function>
        removeListener : <function>
    }
    onShown : {
        addListener : <function>
        removeListener : <function>
    }
    show : <function>
}
Started extension.
Running tests...
RUNNING TEST: extension_testCreatePanel
Panel created
{
    createStatusBarButton : <function>
    onHidden : {
        addListener : <function>
        removeListener : <function>
    }
    onSearch : {
        addListener : <function>
        removeListener : <function>
    }
    onShown : {
        addListener : <function>
        removeListener : <function>
    }
    show : <function>
}