Changed the debugger message API to receive an object instead of a JSON string.

Changed the debugger message API to receive an object instead of a JSON string.

The object delivered to the debug message handler contains additional information on the current break handling the messages.

Clients which require just JSON message parsing can simply get the JSON using the GetJSON message on the message object to still have the previous behaviour.

  NewMessageHangler(const v8::Debug::Message& message) {
    v8::String::Value val(message.GetJSON());
    OldMessageHandler(Vector<uint16_t>(const_cast<uint16_t*>(*val), val.length()));
  }

Refactored some of the debugger code to use internal handles instead of API handles. Also changed Object to JSObject is some places.

The access to the active context when the break occurred is still not implemented. I will add this in a new CL, as this one is quite big already.
Review URL: http://codereview.chromium.org/99122

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@1811 ce2b1a6d-e550-0410-aec6-3dcde31c8c00