Add tests for the BrowserActionsContainer in overflow mode

chrome/browser/extensions/extension_toolbar_model.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_EXTENSIONS_EXTENSION_TOOLBAR_MODEL_H_
 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_TOOLBAR_MODEL_H_
 
 #include "base/compiler_specific.h"
 #include "base/observer_list.h"
 #include "base/prefs/pref_change_registrar.h"
@@ skipping 126 matching lines @@
   // the ToolbarModel to only display those extensions.
   // Highlighting mode is only entered if there is at least one extension to
   // be shown.
   // Returns true if highlighting mode is entered, false otherwise.
   bool HighlightExtensions(const ExtensionIdList& extension_ids);
 
   // Stop highlighting extensions. All extensions can be shown again, and the
   // number of visible icons will be reset to what it was before highlighting.
   void StopHighlighting();
 
+  // Sets the number of visible icons and notifies all observers of the change.
+  void SetVisibleIconCountForTest(size_t visible_icons);
+
  private:
   // content::NotificationObserver:
   virtual void Observe(int type,
                        const content::NotificationSource& source,
                        const content::NotificationDetails& details) OVERRIDE;
 
   // Callback when extensions are ready.
   void OnReady();
 
   // ExtensionRegistryObserver:
@@ skipping 93 matching lines @@
   base::Closure pref_change_callback_;
 
   base::WeakPtrFactory<ExtensionToolbarModel> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ExtensionToolbarModel);
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_TOOLBAR_MODEL_H_