Support dragging panels to stack and snap.

chrome/browser/ui/panels/native_panel_stack.cc

Index: chrome/browser/ui/panels/native_panel_stack.cc
diff --git a/chrome/browser/ui/panels/native_panel_stack.cc b/chrome/browser/ui/panels/native_panel_stack.cc
new file mode 100644
index 0000000000000000000000000000000000000000..8d7efb2c9bf271f4c4c06bb543184021fff9e08d
--- /dev/null
+++ b/chrome/browser/ui/panels/native_panel_stack.cc
@@ -0,0 +1,16 @@
+// Copyright (c) 2013 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.
+
+#include "chrome/browser/ui/panels/native_panel_stack.h"
+
+#include "base/logging.h"
+
+// static
+#if !defined(TOOLKIT_VIEWS)
+NativePanelStack* NativePanelStack::Create(
+    scoped_ptr<StackedPanelCollection> stack) {
+  NOTIMPLEMENTED();
+  return NULL;
+}
+#endif