Changes to support Chrome roll.

tools/dom/idl/dart/dart.idl

Index: tools/dom/idl/dart/dart.idl
diff --git a/tools/dom/idl/dart/dart.idl b/tools/dom/idl/dart/dart.idl
index 1fab40f4397abbda98e24ecfa19a38fad90ccec6..39414204c721cfa1d7336af82481f536e9787d79 100644
--- a/tools/dom/idl/dart/dart.idl
+++ b/tools/dom/idl/dart/dart.idl
@@ -26,6 +26,10 @@ interface ElementTraversal {
 };
 Element implements ElementTraversal;
 
+// TODO(antonm): fix it
+[Supplemental, Constructor]
+interface MediaStream {};
+
 [Callback]
 interface TimeoutHandler {
   void handleEvent();
@@ -287,6 +291,13 @@ interface SVGNumber {
   [StrictTypeChecking, Custom] attribute float value;
 };
 
+// TODO(antonm): get rid of it to follow V8 bindings.
+[
+  Callback
+] interface MutationCallback {
+  [Custom] boolean handleEvent(in MutationRecordArray mutations, in MutationObserver observer);
+};
+
 [Supplemental,
   CustomConstructor,
   // Provide missing constructor signature.