Fix wait in networkIdle when event already fired

We need to register that the `networkIdle` event has fired, just as
we're doing for the `load` and `DOMContentLoaded`. We sometimes see
that the `networkIdle` event is fired before the frame has a chance
to register a listener/handler.

common/frame_manager.go

@@ -216,6 +216,23 @@ func (m *FrameManager) frameLifecycleEvent(frameID cdp.FrameID, event LifecycleE
 	}
 }
 
+// This only tries to recalculate the lifecycle and not set the
+// `networkIdle` state to the Frame. `networkIdle` events need to be
+// handled after `frameLoadingStopped`` has been called (which
+// internally sets the `networkidle` state to the Frame). Once
+// this is done, we can safely recalculateLifecycle which should
+// emit the internal `networkidle` event.
+func (m *FrameManager) frameNetworkIdleLifecycleEvent(frameID cdp.FrameID, event LifecycleEvent) {
+	m.logger.Debugf("FrameManager:frameNetworkIdleLifecycleEvent",
+		"fmid:%d fid:%v event:%s",
+		m.ID(), frameID, lifecycleEventToString[event])
+
+	frame := m.getFrameByID(frameID)
+	if frame != nil {
+		m.MainFrame().recalculateLifecycle() // Recalculate life cycle state from the top
+	}
+}
+
 func (m *FrameManager) frameLoadingStarted(frameID cdp.FrameID) {
 	m.logger.Debugf("FrameManager:frameLoadingStarted",
 		"fmid:%d fid:%v", m.ID(), frameID)

common/frame_session.go

@@ -495,8 +495,8 @@ func (fs *FrameSession) handleFrameTree(frameTree *cdppage.FrameTree) {
 
 func (fs *FrameSession) navigateFrame(frame *Frame, url, referrer string) (string, error) {
 	fs.logger.Debugf("FrameSession:navigateFrame",
-		"sid:%v tid:%v url:%q referrer:%q",
-		fs.session.ID(), fs.targetID, url, referrer)
+		"sid:%v tid:%v url:%q referrer:%q, fid:%s",
+		fs.session.ID(), fs.targetID, url, referrer, frame.id)
 
 	action := cdppage.Navigate(url).WithReferrer(referrer).WithFrameID(cdp.FrameID(frame.ID()))
 	_, documentID, errorText, err := action.Do(cdp.WithExecutor(fs.ctx, fs.session))
@@ -721,6 +721,8 @@ func (fs *FrameSession) onPageLifecycle(event *cdppage.EventLifecycleEvent) {
 		fs.manager.frameLifecycleEvent(event.FrameID, LifecycleEventLoad)
 	case "DOMContentLoaded":
 		fs.manager.frameLifecycleEvent(event.FrameID, LifecycleEventDOMContentLoad)
+	case "networkIdle":
+		fs.manager.frameNetworkIdleLifecycleEvent(event.FrameID, LifecycleEventNetworkIdle)
 	}
 
 	eventToMetric := map[string]*k6metrics.Metric{