[DevTools] Added browser protocol to handler generator

content/browser/devtools/browser_protocol.json

 {
     "version": { "major": "1", "minor": "0" },
     "domains": [{
         "domain": "SystemInfo",
         "description": "The SystemInfo domain defines methods and events for querying low-level system information.",
         "hidden": true,
         "types": [
             {
                 "id": "GPUDevice",
                 "type": "object",
@@ skipping 37 matching lines @@
             }
         ]
     },
     {
         "domain": "Tethering",
         "description": "The Tethering domain defines methods and events for browser port binding.",
         "hidden": true,
         "commands": [
             {
                 "name": "bind",
+                "async": true,
                 "description": "Request browser port binding.",
                 "parameters": [
-                    { "name": "port", "type": "number", "description": "Port number to bind." }
+                    { "name": "port", "type": "integer", "description": "Port number to bind." }
                 ],
                 "handlers": ["browser"]
             },
             {
                 "name": "unbind",
+                "async": true,
                 "description": "Request browser port unbinding.",
                 "parameters": [
-                    { "name": "port", "type": "number", "description": "Port number to unbind." }
+                    { "name": "port", "type": "integer", "description": "Port number to unbind." }
                 ],
                 "handlers": ["browser"]
             }
         ],
         "events": [
             {
                 "name": "accepted",
                 "description": "Informs that port was successfully bound and got a specified connection id.",
                 "parameters": [
-                    {"name": "port", "type": "number", "description": "Port number that was successfully bound." },
+                    {"name": "port", "type": "integer", "description": "Port number that was successfully bound." },
                     {"name": "connectionId", "type": "string", "description": "Connection id to be used." }
                 ],
                 "handlers": ["browser"]
             }
         ]
     }]
 }