Add component instance to onSetState in ReactDebugTool

[omerts]

Unless there is some other cleanway to sniff the state (without monkeypatching), it would be great to get the actual component instance which has raised the onSetState in ReactDebugTool.

[gaearon]

For the record, we plan to provide an official introspection API for this.
#6488 is the start of this.

What information would you like to extract about the instance that has been updated?

[omerts]

@gaearon, thanks waiting for the update