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

client/html/generated/html/dartium/ArrayBuffer.dart

+
+class _ArrayBufferImpl extends _DOMTypeBase implements ArrayBuffer {
+  _ArrayBufferImpl._wrap(ptr) : super._wrap(ptr);
+
+  int get byteLength() => _wrap(_ptr.byteLength);
+
+  ArrayBuffer slice(int begin, [int end = null]) {
+    if (end === null) {
+      return _wrap(_ptr.slice(_unwrap(begin)));
+    } else {
+      return _wrap(_ptr.slice(_unwrap(begin), _unwrap(end)));
+    }
+  }
+}