Add missing includes (spotted while splitting cpp derived sources).

client/dom/idl/dart/dart.idl

 
 // This file introduces / supplements and forces Dart declarations.
 
 module default {
   NamedNodeMap implements sequence<Node>;
   NodeList implements sequence<Node>;
   HTMLCollection implements sequence<Node>;
   MediaList implements sequence<DOMString>;
   StyleSheetList implements sequence<StyleSheet>;
   TouchList implements sequence<Touch>;
   CanvasPixelArray implements sequence<int>;
 
   Float32Array implements sequence<double>;
   Float64Array implements sequence<double>;
   Int8Array implements sequence<int>;
   Int16Array implements sequence<int>;
   Int32Array implements sequence<int>;
   Uint8Array implements sequence<int>;
   Uint16Array implements sequence<int>;
   Uint32Array implements sequence<int>;
 
   // Is List<int> because inherits from Uint8Array:
   // Uint8ClampedArray implements sequence<int>;
 }
 
+module core {
+  [Supplemental]
+  interface Document {
+    [Suppressed] object getCSSCanvasContext(in DOMString contextId, in DOMString name, in long width, in long height);
+    CanvasRenderingContext getCSSCanvasContext(in DOMString contextId, in DOMString name, in long width, in long height);
+  };
+};
+
 module dom {
   // Force NodeSelector. WebKit defines these operations directly.
   interface NodeSelector {
     Element   querySelector(in DOMString selectors);
     NodeList  querySelectorAll(in DOMString selectors);
   };
   Document implements NodeSelector;
   DocumentFragment implements NodeSelector;
   Element implements NodeSelector;
 
@@ skipping 176 matching lines @@
   [Supplemental, Callback] // Add missing Callback attribute.
   interface VoidCallback {
   };
 };
 
 module svg {
     interface SVGNumber {
       [StrictTypeChecking, Custom] attribute double value;
     };
 }