[Extensions Toolbar] Make the ExtensionToolbarModel icon count more stable

chrome/browser/ui/toolbar/toolbar_actions_bar_delegate.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_TOOLBAR_TOOLBAR_ACTIONS_BAR_DELEGATE_H_
 #define CHROME_BROWSER_UI_TOOLBAR_TOOLBAR_ACTIONS_BAR_DELEGATE_H_
 
 #include "ui/gfx/animation/tween.h"
 #include "ui/gfx/geometry/size.h"
 
 class ToolbarActionViewController;
 
 // The delegate class (which, in production, represents the view) of the
 // ToolbarActionsBar.
 class ToolbarActionsBarDelegate {
  public:
   virtual ~ToolbarActionsBarDelegate() {}
 
+  // Returns true if the delegate is ready to start adding views.
+  virtual bool IsReady() const = 0;

[Peter Kasting, 2014/11/14 21:31:58]

Nit: Maybe IsReadyToAddViews()?

[Devlin, 2014/11/14 22:00:37]

Sure. Done.

+
   // Adds a view for the given |action| at |index|.
   virtual void AddViewForAction(ToolbarActionViewController* action,
                                 size_t index) = 0;
 
   // Removes the view for the given |action|.
   virtual void RemoveViewForAction(ToolbarActionViewController* action) = 0;
 
   // Removes all action views.
   virtual void RemoveAllViews() = 0;
 
@@ skipping 21 matching lines @@
   virtual void StopAnimating() = 0;
 
   // Returns the width (including padding) for the overflow chevron.
   virtual int GetChevronWidth() const = 0;
 
   // Returns true if there is currently a popup running.
   virtual bool IsPopupRunning() const = 0;
 };
 
 #endif  // CHROME_BROWSER_UI_TOOLBAR_TOOLBAR_ACTIONS_BAR_DELEGATE_H_