MutationObserver

lib/dom/idl/dart/dart.idl

Index: lib/dom/idl/dart/dart.idl
diff --git a/lib/dom/idl/dart/dart.idl b/lib/dom/idl/dart/dart.idl
index 2cc6d1c2b25e9b464a31bf818f96b0890f5cf49f..e41da0d44df45a350e36d748777ce993656baf51 100644
--- a/lib/dom/idl/dart/dart.idl
+++ b/lib/dom/idl/dart/dart.idl
@@ -277,3 +277,23 @@ module svg {
     [StrictTypeChecking, Custom] attribute float value;
   };
 }
+
+module core {
+  [Supplemental]
+  interface MutationCallback {
+    // Change MutationRecordArray to MutationRecord[].
+    [Suppressed, Custom] boolean handleEvent(in MutationRecordArray mutations, in WebKitMutationObserver observer);
+    [Custom] boolean handleEvent(in MutationRecord[] mutations, in WebKitMutationObserver observer);
+  };
+
+  [Supplemental,
+   CustomConstructor,
+   // Provide missing constructor signature.
+   Constructor(MutationCallback callback)]
+  interface WebKitMutationObserver {
+    // Rename 'observe' so we can define a new 'observe' API implemented using
+    // the original.
+    [DartName=_observe] void observe(in Node target, in Dictionary options)

[Anton Muhin, 2012/07/13 10:50:47]

as you probably already know, that's exactly the signature in WebKit idl:
http://trac.webkit.org/browser/trunk/Source/WebCore/dom/MutationObserver.idl?...

[sra1, 2012/07/19 00:34:54]

Yes.  To copy the extended attribute DartName onto the operation it must be the
matching overload.

+        raises(DOMException);
+  };
+}