Add panels as a single group of windows per display for overview window cycling.

ash/wm/overview/window_selector_item.cc

Index: ash/wm/overview/window_selector_item.cc
diff --git a/ash/wm/overview/window_selector_item.cc b/ash/wm/overview/window_selector_item.cc
new file mode 100644
index 0000000000000000000000000000000000000000..b5ee7c1b60a2bc7e78c0690929f59d9072dcc605
--- /dev/null
+++ b/ash/wm/overview/window_selector_item.cc
@@ -0,0 +1,21 @@
+// Copyright 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 "ash/wm/overview/window_selector_item.h"
+
+namespace ash {
+
+WindowSelectorItem::WindowSelectorItem() {
+}
+
+WindowSelectorItem::~WindowSelectorItem() {
+}
+
+void WindowSelectorItem::SetBounds(aura::RootWindow* root_window,
+                                   const gfx::Rect& target_bounds) {
+  bounds_ = target_bounds;
+  SetItemBounds(root_window, target_bounds);
+}
+
+}  // namespace ash