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

ash/wm/overview/window_selector_item.h

Index: ash/wm/overview/window_selector_item.h
diff --git a/ash/wm/overview/window_selector_item.h b/ash/wm/overview/window_selector_item.h
index eedf3e1f9153c56f33d0073018cb147bbf2e091a..8b5d6da4941b2d5d475483bc9aa2ce4785be4203 100644
--- a/ash/wm/overview/window_selector_item.h
+++ b/ash/wm/overview/window_selector_item.h
@@ -6,22 +6,34 @@
 #define ASH_WM_OVERVIEW_WINDOW_SELECTOR_ITEM_H_
 
 #include "base/compiler_specific.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/strings/string16.h"
 #include "ui/gfx/rect.h"
 
 namespace aura {
 class Window;
 }
 
+namespace views {
+class Widget;
+}
+
 namespace ash {
 
 // This class represents an item in overview mode. An item can have one or more
 // windows, of which only one can be activated by keyboard (i.e. alt+tab) but
 // any can be selected with a pointer (touch or mouse).
 class WindowSelectorItem {
+ friend class WindowSelectorTest;
+
  public:
   WindowSelectorItem();
   virtual ~WindowSelectorItem();
 
+  // The time for the close buttons and labels to fade in when initially shown
+  // on entering overview mode.
+  static const int kFadeInMilliseconds;
+
   // Returns the root window on which this item is shown.
   virtual aura::Window* GetRootWindow() = 0;
 
@@ -39,6 +51,7 @@ class WindowSelectorItem {
 
   // Returns the |window| to activate on selecting of this item.
   virtual aura::Window* SelectionWindow() = 0;
+  virtual const aura::Window* SelectionWindow() const = 0;
 
   // Removes |window| from this item. Check empty() after calling this to see
   // if the entire item is now empty.
@@ -74,6 +87,10 @@ class WindowSelectorItem {
   // Sets the bounds used by the selector item's windows.
   void set_bounds(const gfx::Rect& bounds) { bounds_ = bounds; }
 
+  // Creates a label to display under the window selector item.
+  void UpdateWindowLabels(const gfx::Rect& target_bounds,
+                          aura::Window* root_window);
+
  private:
   // The root window this item is being displayed on.
   aura::Window* root_window_;
@@ -90,6 +107,9 @@ class WindowSelectorItem {
   // a window layer for display on another monitor.
   bool in_bounds_update_;
 
+  // Label under the window displaying its active tab name.
+  scoped_ptr<views::Widget> window_label_;
+
   DISALLOW_COPY_AND_ASSIGN(WindowSelectorItem);
 };