UserAgent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/51.0.2704.103 Safari/537.36

Steps to reproduce the problem:
Electron (http://electron.atom.io/) is a popular open source project based on Chromium. One of the functions that Electron exposes is the ability to send input events to the document. This is quite useful and enables some opportunities for automated testing and simulating of events:

https://github.com/electron/electron/blob/master/docs/api/web-contents.md#webcontentssendinputeventevent

Unfortunately, the underlying Chromium functions that Electron uses for this functionality are asynchronous and do not provide a way to know when they have completed. This makes it impossible to send multiple events in succession or have any guarantee they will arrive in order.

I believe the underlying functions are:

ForwardMouseEvent
ForwardKeyboardEvent
ForwardWheelEvent

See https://github.com/electron/electron/blob/7d38384bddb5eda16dce945edfbd5c3081646df0/atom/browser/api/atom_api_web_contents.cc#L1150-L1182 for the reference implementation.

Is there any way for me to update this code such that I will know when the event has been fully processed?

Here is my related issue on the Electron project:

https://github.com/electron/electron/issues/6291

Thanks!

What is the expected behavior?

What went wrong?
Currently Chromium offers no ability to know when these events have completed:

ForwardMouseEvent
ForwardKeyboardEvent
ForwardWheelEvent

Did this work before? N/A 

Chrome version: 51.0.2704.103  Channel: n/a
OS Version: OS X 10.11.5
Flash Version: Shockwave Flash 22.0 r0