Merge pull request #12 from quamotion/fixes/optional-arguments

...Tools/Protocol/iOS/Network/WebSocketFrameReceivedEvent.cs

...eDevTools/Protocol/iOS/Network/WebSocketFrameSentEvent.cs

...ol/iOS/Network/WebSocketHandshakeResponseReceivedEvent.cs

...col/iOS/Network/WebSocketWillSendHandshakeRequestEvent.cs

...e/ChromeDevTools/Protocol/iOS/OverlayTypes/ElementData.cs

...vTools/Protocol/iOS/OverlayTypes/FragmentHighlightData.cs

...meDevTools/Protocol/iOS/OverlayTypes/NodeHighlightData.cs

source/ChromeDevTools/Protocol/iOS/OverlayTypes/Region.cs

...omeDevTools/Protocol/iOS/OverlayTypes/ShapeOutsideData.cs

...meDevTools/Protocol/iOS/Page/DomContentEventFiredEvent.cs

source/ChromeDevTools/Protocol/iOS/Page/Frame.cs

...Protocol/iOS/Page/FrameClearedScheduledNavigationEvent.cs

...ce/ChromeDevTools/Protocol/iOS/Page/FrameDetachedEvent.cs

...e/ChromeDevTools/Protocol/iOS/Page/FrameNavigatedEvent.cs

source/ChromeDevTools/Protocol/iOS/Page/FrameResource.cs

source/ChromeDevTools/Protocol/iOS/Page/FrameResourceTree.cs

...vTools/Protocol/iOS/Page/FrameScheduledNavigationEvent.cs

...omeDevTools/Protocol/iOS/Page/FrameStartedLoadingEvent.cs

...omeDevTools/Protocol/iOS/Page/FrameStoppedLoadingEvent.cs

...vTools/Protocol/iOS/Page/HandleJavaScriptDialogCommand.cs