gistfile1.txt

diff --git a/js/public/StructuredClone.h b/js/public/StructuredClone.h
--- a/js/public/StructuredClone.h
+++ b/js/public/StructuredClone.h
@@ -235,11 +235,14 @@ JS_ReadTypedArray(JSStructuredCloneReade
 
 JS_PUBLIC_API(bool)
 JS_WriteUint32Pair(JSStructuredCloneWriter *w, uint32_t tag, uint32_t data);
 
 JS_PUBLIC_API(bool)
 JS_WriteBytes(JSStructuredCloneWriter *w, const void *p, size_t len);
 
 JS_PUBLIC_API(bool)
+JS_WriteString(JSStructuredCloneWriter *w, JS::HandleString str);
+
+JS_PUBLIC_API(bool)
 JS_WriteTypedArray(JSStructuredCloneWriter *w, JS::HandleValue v);
 
 #endif  /* js_StructuredClone_h */
diff --git a/js/src/vm/StructuredClone.cpp b/js/src/vm/StructuredClone.cpp
--- a/js/src/vm/StructuredClone.cpp
+++ b/js/src/vm/StructuredClone.cpp
@@ -330,16 +330,17 @@ struct JSStructuredCloneWriter {
 
     // Any value passed to JS_WriteStructuredClone.
     void *closure;
 
     // List of transferable objects
     RootedValue transferable;
     AutoObjectVector transferableObjects;
 
+    friend bool JS_WriteString(JSStructuredCloneWriter *w, HandleString str);
     friend bool JS_WriteTypedArray(JSStructuredCloneWriter *w, HandleValue v);
 };
 
 JS_FRIEND_API(uint64_t)
 js_GetSCOffset(JSStructuredCloneWriter* writer)
 {
     MOZ_ASSERT(writer);
     return writer->output().count() * sizeof(uint64_t);
@@ -2126,15 +2127,21 @@ JS_WriteUint32Pair(JSStructuredCloneWrit
 
 JS_PUBLIC_API(bool)
 JS_WriteBytes(JSStructuredCloneWriter *w, const void *p, size_t len)
 {
     return w->output().writeBytes(p, len);
 }
 
 JS_PUBLIC_API(bool)
+JS_WriteString(JSStructuredCloneWriter *w, HandleString str)
+{
+    return w->writeString(SCTAG_STRING, str);
+}
+
+JS_PUBLIC_API(bool)
 JS_WriteTypedArray(JSStructuredCloneWriter *w, HandleValue v)
 {
     MOZ_ASSERT(v.isObject());
     assertSameCompartment(w->context(), v);
     RootedObject obj(w->context(), &v.toObject());
     return w->writeTypedArray(obj);
 }