QV8DebugService: Return JSON messages for internal requests.
QV8DebugService: Return JSON messages for internal requests.

Internal requests are not handles by V8. Hence, create a JSON
message similar to v8 debugging protocol and send it to client.
This is only for uniformity wrt to debug requests.

Change-Id: Ia0a3cda0ef157b852fb4402fde62b4651a95bd56
Reviewed-by: Kai Koehne <077bc265216106fb22408e62f2d97925ede69d10@nokia.com>

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