--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/org.chromium.sdk/src/org/chromium/sdk/LiveEditExtension.java	Mon Jun 07 16:51:19 2010 -0700
@@ -0,0 +1,38 @@
+// Copyright (c) 2010 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+package org.chromium.sdk;
+
+/**
+ * Helper class for experimental support of LiveEdit feature. While regular API does not
+ * support LiveEdit (not to break compatibility with existing clients), it gives access to extended
+ * interfaces.
+ * <p>
+ * This class encapsulates all instanceofs/casts that are considered to be untrackable
+ * in the main code and therefore harmful.
+ */
+public class LiveEditExtension {
+  /**
+   * Casts script to the interface that supports updating source on remote VM.
+   * @return extended interface or null if unsupported
+   */
+  public static UpdatableScript castToUpdatableScript(Script script) {
+    if (script instanceof UpdatableScript == false) {
+      return null;
+    }
+    return (UpdatableScript) script;
+  }
+
+  /**
+   * Casts listener to interface that accepts LiveEdit-related events.
+   * @return extended interface or null if unsupported
+   */
+  public static LiveEditDebugEventListener castToLiveEditListener(
+      DebugEventListener debugEventListener) {
+    if (debugEventListener instanceof LiveEditDebugEventListener == false) {
+      return null;
+    }
+    return (LiveEditDebugEventListener) debugEventListener;
+  }
+}