Roll IDL to Dartium37 (r181268)

core/events/MouseEvent.idl

Index: core/events/MouseEvent.idl
diff --git a/core/events/MouseEvent.idl b/core/events/MouseEvent.idl
index 7dd8284bf78d89c4963cf301930e15a756fa0f82..f5b03c862d9ef20bacdf38f6dd2d5f178741c9c3 100644
--- a/core/events/MouseEvent.idl
+++ b/core/events/MouseEvent.idl
@@ -30,8 +30,10 @@
     [InitializedByEventConstructor] readonly attribute boolean          metaKey;
     [InitializedByEventConstructor] readonly attribute unsigned short   button;
     [InitializedByEventConstructor] readonly attribute EventTarget?     relatedTarget;
-                                    readonly attribute long             webkitMovementX;
-                                    readonly attribute long             webkitMovementY;
+    [MeasureAs=MouseEventMovementX] readonly attribute long             movementX;
+    [MeasureAs=MouseEventMovementY] readonly attribute long             movementY;
+    [MeasureAs=PrefixedMouseEventMovementX, ImplementedAs=movementX] readonly attribute long webkitMovementX;
+    [MeasureAs=PrefixedMouseEventMovementY, ImplementedAs=movementY] readonly attribute long webkitMovementY;
 
      void initMouseEvent([Default=Undefined] optional DOMString type,
                                        [Default=Undefined] optional boolean canBubble,
@@ -57,6 +59,6 @@
     readonly attribute Node             fromElement;
     readonly attribute Node             toElement;
 
-    readonly attribute Clipboard        dataTransfer;
+    readonly attribute DataTransfer     dataTransfer;
 };