Method that will be called on receipt of a DevTools protocol message. |browser| is the originating browser instance. |message| is a UTF8-encoded JSON dictionary representing either a function result or an event. |message| is only valid for the scope of this callback and should be copied if necessary. Return true (1) if the message was handled or false (0) if the message should be further processed and passed to the OnDevToolsMethodResult or OnDevToolsEvent functions as appropriate.
Method result dictionaries include an "id" (int) value that identifies the
Base structure.