Add tests for the BrowserActionsContainer in overflow mode

chrome/browser/extensions/extension_toolbar_model.cc

 // 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.
 
 #include "chrome/browser/extensions/extension_toolbar_model.h"
 
 #include <algorithm>
 #include <string>
 
 #include "base/message_loop/message_loop.h"
@@ skipping 674 matching lines @@
     highlighted_items_.clear();
     is_highlighting_ = false;
     if (old_visible_icon_count_ != visible_icon_count_) {
       SetVisibleIconCount(old_visible_icon_count_);
       FOR_EACH_OBSERVER(Observer, observers_, ToolbarVisibleCountChanged());
     }
     FOR_EACH_OBSERVER(Observer, observers_, ToolbarHighlightModeChanged(false));
   }
 }
 
+void ExtensionToolbarModel::SetVisibleIconCountForTest(size_t visible_icons) {
+  SetVisibleIconCount(visible_icons);
+  FOR_EACH_OBSERVER(Observer, observers_, ToolbarVisibleCountChanged());
+}
+
 }  // namespace extensions