Added labels under the windows in OverviewMode displaying their current name.

ash/wm/overview/window_selector_panels.cc

Index: ash/wm/overview/window_selector_panels.cc
diff --git a/ash/wm/overview/window_selector_panels.cc b/ash/wm/overview/window_selector_panels.cc
index bd165b21a9ba9f78b1ac81b9593481f8ccb729c9..9d2dc322ca55a1e891c9a33fbe14178f97206b88 100644
--- a/ash/wm/overview/window_selector_panels.cc
+++ b/ash/wm/overview/window_selector_panels.cc
@@ -129,6 +129,10 @@ aura::Window* WindowSelectorPanels::SelectionWindow() {
   return transform_windows_.front()->window();
 }
 
+const aura::Window* WindowSelectorPanels::SelectionWindow() const {
+  return transform_windows_.front()->window();
+}
+
 void WindowSelectorPanels::RemoveWindow(const aura::Window* window) {
   for (WindowList::iterator iter = transform_windows_.begin();
        iter != transform_windows_.end(); ++iter) {