Dynamically calculate the number of extension icons to show per row in overflow

chrome/browser/ui/views/toolbar/extension_toolbar_menu_view.h

 // Copyright 2014 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_VIEWS_TOOLBAR_EXTENSION_TOOLBAR_MENU_VIEW_H_
 #define CHROME_BROWSER_UI_VIEWS_TOOLBAR_EXTENSION_TOOLBAR_MENU_VIEW_H_
 
 #include "base/memory/weak_ptr.h"
 #include "base/scoped_observer.h"
 #include "chrome/browser/ui/views/toolbar/browser_actions_container_observer.h"
 #include "ui/views/view.h"
 
 class Browser;
 class BrowserActionsContainer;
 class WrenchMenu;
 
+namespace views {
+class MenuItemView;
+}
+
 // ExtensionToolbarMenuView is the view containing the extension actions that
 // overflowed from the BrowserActionsContainer, and is contained in and owned by
 // the wrench menu.
 // In the event that the WrenchMenu was opened for an Extension Action drag-and-
 // drop, this will also close the menu upon completion.
 class ExtensionToolbarMenuView : public views::View,
                                  public BrowserActionsContainerObserver {
  public:
   ExtensionToolbarMenuView(Browser* browser, WrenchMenu* wrench_menu);
   virtual ~ExtensionToolbarMenuView();
 
+  // Initialize the view and have it calculate the number of icons that will
+  // be shown on each row. This will likely cause a change in menu width.
+  void Init(views::MenuItemView* menu_root);
+
   // views::View:
   virtual gfx::Size GetPreferredSize() const OVERRIDE;
   virtual void Layout() OVERRIDE;
 
  private:
   // BrowserActionsContainerObserver:
   virtual void OnBrowserActionDragDone() OVERRIDE;
 
   // The associated browser.
   Browser* browser_;
 
   // The WrenchMenu, which may need to be closed after a drag-and-drop.
   WrenchMenu* wrench_menu_;
 
   // The overflow BrowserActionsContainer which is nested in this view.
   BrowserActionsContainer* container_;
 
   ScopedObserver<BrowserActionsContainer, BrowserActionsContainerObserver>
       browser_actions_container_observer_;
 
+  // The padding before the container's view.
+  int start_padding_;
+
+  // The padding between the container and the edge of the menu.
+  int end_padding_;
+
   DISALLOW_COPY_AND_ASSIGN(ExtensionToolbarMenuView);
 };
 
 #endif  // CHROME_BROWSER_UI_VIEWS_TOOLBAR_EXTENSION_TOOLBAR_MENU_VIEW_H_