Updating to latest chrome protocol.json

cdp/network/types.go

@@ -484,6 +484,7 @@ func (t InitiatorType) String() string {
 const (
 	InitiatorTypeParser  InitiatorType = "parser"
 	InitiatorTypeScript  InitiatorType = "script"
+	InitiatorTypePreload InitiatorType = "preload"
 	InitiatorTypeOther   InitiatorType = "other"
 )
 
@@ -504,6 +505,8 @@ func (t *InitiatorType) UnmarshalEasyJSON(in *jlexer.Lexer) {
 		*t = InitiatorTypeParser
 	case InitiatorTypeScript:
 		*t = InitiatorTypeScript
+	case InitiatorTypePreload:
+		*t = InitiatorTypePreload
 	case InitiatorTypeOther:
 		*t = InitiatorTypeOther
 

cmd/chromedp-gen/protocol.json

@@ -2405,6 +2405,7 @@
               "enum": [
                 "parser",
                 "script",
+                "preload",
                 "other"
               ],
               "description": "Type of this initiator."