Added support for self.origin in Window and WorkerGlobalScope

third_party/WebKit/Source/core/workers/WorkerGlobalScope.idl

Index: third_party/WebKit/Source/core/workers/WorkerGlobalScope.idl
diff --git a/third_party/WebKit/Source/core/workers/WorkerGlobalScope.idl b/third_party/WebKit/Source/core/workers/WorkerGlobalScope.idl
index 2c6f355a2bf682f5cdb7cacef25468cbbbec0c08..e6c5fc5579ae2991ea1efce0ae4cd2aae6369212 100644
--- a/third_party/WebKit/Source/core/workers/WorkerGlobalScope.idl
+++ b/third_party/WebKit/Source/core/workers/WorkerGlobalScope.idl
@@ -63,6 +63,9 @@
     // Secure Contexts
     // https://w3c.github.io/webappsec-secure-contexts/#dom-windoworworkerglobalscope-issecurecontext
     [ImplementedAs=isSecureContextForBindings] readonly attribute boolean isSecureContext;
+
+    // https://html.spec.whatwg.org/#windoworworkerglobalscope-mixin
+    [Replaceable] readonly attribute DOMString origin;
 };
 
 WorkerGlobalScope implements WindowBase64;