Add dummy dart:html library for documentation.

lib/html/doc/interface/DynamicsCompressorNode.dart

Index: lib/html/doc/interface/DynamicsCompressorNode.dart
diff --git a/lib/html/doc/interface/DynamicsCompressorNode.dart b/lib/html/doc/interface/DynamicsCompressorNode.dart
new file mode 100644
index 0000000000000000000000000000000000000000..668275d30b79c58837af91b90de037255bf91c97
--- /dev/null
+++ b/lib/html/doc/interface/DynamicsCompressorNode.dart
@@ -0,0 +1,27 @@
+// Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+// WARNING: Do not edit - generated code.
+
+/// @domName DynamicsCompressorNode
+interface DynamicsCompressorNode extends AudioNode {
+
+  /** @domName DynamicsCompressorNode.attack */
+  final AudioParam attack;
+
+  /** @domName DynamicsCompressorNode.knee */
+  final AudioParam knee;
+
+  /** @domName DynamicsCompressorNode.ratio */
+  final AudioParam ratio;
+
+  /** @domName DynamicsCompressorNode.reduction */
+  final AudioParam reduction;
+
+  /** @domName DynamicsCompressorNode.release */
+  final AudioParam release;
+
+  /** @domName DynamicsCompressorNode.threshold */
+  final AudioParam threshold;
+}