Generate dart:html bindings for Dartium as well as Frog. All unittests now pass (or are disabled fo…

client/html/generated/html/dartium/CanvasGradient.dart

+
+class _CanvasGradientImpl extends _DOMTypeBase implements CanvasGradient {
+  _CanvasGradientImpl._wrap(ptr) : super._wrap(ptr);
+
+  void addColorStop(num offset, String color) {
+    _ptr.addColorStop(_unwrap(offset), _unwrap(color));
+    return;
+  }
+}