DevTools: Send async stack trace with Network.Initiator.

Source/devtools/protocol.json

Index: Source/devtools/protocol.json
diff --git a/Source/devtools/protocol.json b/Source/devtools/protocol.json
index 02f91e9722cc3db0dd79ce08a8ef7f3b7f40042b..416e2632fae235149e5b71fdaa417766adec962e 100644
--- a/Source/devtools/protocol.json
+++ b/Source/devtools/protocol.json
@@ -1138,7 +1138,8 @@
                     { "name": "type", "type": "string", "enum": ["parser", "script", "other"], "description": "Type of this initiator." },
                     { "name": "stackTrace", "$ref": "Console.StackTrace", "optional": true, "description": "Initiator JavaScript stack trace, set for Script only." },
                     { "name": "url", "type": "string", "optional": true, "description": "Initiator URL, set for Parser type only." },
-                    { "name": "lineNumber", "type": "number", "optional": true, "description": "Initiator line number, set for Parser type only." }
+                    { "name": "lineNumber", "type": "number", "optional": true, "description": "Initiator line number, set for Parser type only." },
+                    { "name": "asyncStackTrace", "$ref": "Console.AsyncStackTrace", "optional": true, "description": "Initiator asynchronous JavaScript stack trace, if available.", "hidden": true }
                 ]
             }
         ],