Add `disposition` to SecurityPolicyViolationEvent

third_party/WebKit/Source/core/events/SecurityPolicyViolationEvent.idl

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-// http://w3c.github.io/webappsec/specs/content-security-policy/#securitypolicyviolationevent-interface
+// https://w3c.github.io/webappsec-csp/#idl-index
+
+enum SecurityPolicyViolationEventDisposition {
+    "enforce", "report"
+};
 
 [
     Constructor(DOMString type, optional SecurityPolicyViolationEventInit eventInitDict),
 ] interface SecurityPolicyViolationEvent : Event {
     // TODO(foolip): The spec says "documentURL".
     [Measure] readonly attribute DOMString documentURI;
     readonly attribute DOMString referrer;
     // TODO(foolip): The spec says "blockedURL".
     [Measure] readonly attribute DOMString blockedURI;
     readonly attribute DOMString violatedDirective;
     readonly attribute DOMString effectiveDirective;
     readonly attribute DOMString originalPolicy;
+    readonly attribute SecurityPolicyViolationEventDisposition disposition;
     readonly attribute DOMString sourceFile;
     [Measure] readonly attribute unsigned short statusCode;
     readonly attribute long      lineNumber;
     readonly attribute long      columnNumber;
 };