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

ash/wm/overview/window_selector_panels.h

Index: ash/wm/overview/window_selector_panels.h
diff --git a/ash/wm/overview/window_selector_panels.h b/ash/wm/overview/window_selector_panels.h
index 88c31a24719052d09307697971029530a7ceaaa7..a21b52bf2b41c2b84d879c301bfea8a2bda2f0fe 100644
--- a/ash/wm/overview/window_selector_panels.h
+++ b/ash/wm/overview/window_selector_panels.h
@@ -32,6 +32,7 @@ class WindowSelectorPanels : public WindowSelectorItem {
   virtual aura::Window* TargetedWindow(const aura::Window* target) OVERRIDE;
   virtual void RestoreWindowOnExit(aura::Window* window) OVERRIDE;
   virtual aura::Window* SelectionWindow() OVERRIDE;
+  virtual const aura::Window* SelectionWindow() const OVERRIDE;
   virtual void RemoveWindow(const aura::Window* window) OVERRIDE;
   virtual bool empty() const OVERRIDE;
   virtual void PrepareForOverview() OVERRIDE;