[test fixlet] Add tests for the zoom icon in the location bar on GTK.

chrome/browser/ui/gtk/zoom_bubble_gtk.h

 // Copyright (c) 2012 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.
 
 #ifndef CHROME_BROWSER_UI_GTK_ZOOM_BUBBLE_GTK_H_
 #define CHROME_BROWSER_UI_GTK_ZOOM_BUBBLE_GTK_H_
 
 #include "base/basictypes.h"
 #include "base/timer.h"
 #include "chrome/browser/ui/gtk/bubble/bubble_gtk.h"
 #include "ui/base/gtk/gtk_signal.h"
 
 class TabContents;
 
 typedef struct _GtkWidget GtkWidget;
 
 class ZoomBubbleGtk {
  public:
   // Shows the zoom bubble, pointing at |anchor_widget|.
   static void Show(GtkWidget* anchor, TabContents* tab_contents,
       bool auto_close);
 
   // Closes the zoom bubble.
   static void Close();
 
+  // Whether the zoom bubble is currently showing.
+  static bool IsShowing();
+
  private:
   ZoomBubbleGtk(GtkWidget* anchor, TabContents* tab_contents, bool auto_close);
   virtual ~ZoomBubbleGtk();
 
   // Convenience method to start |timer_| if |auto_close_| is true.
   void StartTimerIfNecessary();
 
   // Stops any close timer if |timer_| is currently running.
   void StopTimerIfNecessary();
 
   // Refreshes the bubble by changing the zoom percentage appropriately and
   // resetting the timer if necessary.
   void Refresh();
 
   // Closes the zoom bubble.
   void CloseBubble();
 
   // Notified when the bubble is destroyed so this instance can be deleted.
   CHROMEGTK_CALLBACK_0(ZoomBubbleGtk, void, OnDestroy);
 
   // Fired when the reset link is clicked.
   CHROMEGTK_CALLBACK_0(ZoomBubbleGtk, void, OnSetDefaultLinkClick);
 
   // Fired when the mouse enters or leaves the widget.
   CHROMEGTK_CALLBACK_1(ZoomBubbleGtk, gboolean, OnMouseEnter,
                        GdkEventCrossing*);
   CHROMEGTK_CALLBACK_1(ZoomBubbleGtk, gboolean, OnMouseLeave,
                        GdkEventCrossing*);
 
+  // Friend the tests so they can check access the static bubble.
+  friend class ZoomBubbleGtkTest;
+
+  // Pointer to singleton object (NULL if no bubble is open).
+  static ZoomBubbleGtk* g_bubble;
+
   // Whether the currently displayed bubble will automatically close.
   bool auto_close_;
 
   // Whether the mouse is currently inside the bubble.
   bool mouse_inside_;
 
   // Timer used to close the bubble when |auto_close_| is true.
   base::OneShotTimer<ZoomBubbleGtk> timer_;
 
   // The TabContents for the page whose zoom has changed.
   TabContents* tab_contents_;
 
   // An event box that wraps the content of the bubble.
   GtkWidget* event_box_;
 
   // Label showing zoom percentage.
   GtkWidget* label_;
 
   // The BubbleGtk object containing the zoom bubble's content.
   BubbleGtk* bubble_;
 
   DISALLOW_COPY_AND_ASSIGN(ZoomBubbleGtk);
 };
 
 #endif  // CHROME_BROWSER_UI_GTK_ZOOM_BUBBLE_GTK_H_