DevTools: Expand protocol to allow setting DOM event breakpoints on a given event target.

Source/devtools/protocol.json

 {
     "version": { "major": "1", "minor": "1" },
     "domains": [{
         "domain": "Inspector",
         "hidden": true,
         "types": [],
         "commands": [
             {
                 "name": "enable",
                 "description": "Enables inspector domain notifications."
@@ skipping 3330 matching lines @@
                 "name": "removeDOMBreakpoint",
                 "parameters": [
                     { "name": "nodeId", "$ref": "DOM.NodeId", "description": "Identifier of the node to remove breakpoint from." },
                     { "name": "type", "$ref": "DOMBreakpointType", "description": "Type of the breakpoint to remove." }
                 ],
                 "description": "Removes DOM breakpoint that was set using <code>setDOMBreakpoint</code>."
             },
             {
                 "name": "setEventListenerBreakpoint",
                 "parameters": [
-                    { "name": "eventName", "type": "string", "description": "DOM Event name to stop on (any DOM event will do)." }
+                    { "name": "eventName", "type": "string", "description": "DOM Event name to stop on (any DOM event will do)." },
+                    { "name": "targetName", "type": "string", "optional": true, "description": "EventTarget interface name to stop on. If equal to <code>\"*\"</code> or not provided, will stop on any EventTarget.", "hidden": true }
                 ],
                 "description": "Sets breakpoint on particular DOM event."
             },
             {
                 "name": "removeEventListenerBreakpoint",
                 "parameters": [
-                    { "name": "eventName", "type": "string", "description": "Event name." }
+                    { "name": "eventName", "type": "string", "description": "Event name." },
+                    { "name": "targetName", "type": "string", "optional": true, "description": "EventTarget interface name.", "hidden": true }
                 ],
                 "description": "Removes breakpoint on particular DOM event."
             },
             {
                 "name": "setInstrumentationBreakpoint",
                 "parameters": [
                     { "name": "eventName", "type": "string", "description": "Instrumentation name to stop on." }
                 ],
                 "description": "Sets breakpoint on particular native event.",
                 "hidden": true
@@ skipping 818 matching lines @@
             {
                 "name": "dataAvailable",
                 "parameters": [
                     {"name": "value", "type": "array", "items": { "$ref": "PowerEvent" }, "description": "List of power events." }
                 ],
                 "handlers": ["browser", "frontend"]
             }
         ]
     }]
 }