[Extensions UI] Handle multiple warning bubbles racing to show

chrome/browser/ui/toolbar/toolbar_actions_bar.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_H_
 #define CHROME_BROWSER_UI_TOOLBAR_TOOLBAR_ACTIONS_BAR_H_
 
 #include <stddef.h>
 
 #include <memory>
@@ skipping 231 matching lines @@
                   : ToolbarActionsModel::HIGHLIGHT_NONE;
   }
   const PlatformSettings& platform_settings() const {
     return platform_settings_;
   }
   ToolbarActionViewController* popup_owner() { return popup_owner_; }
   ToolbarActionViewController* popped_out_action() {
     return popped_out_action_;
   }
   bool in_overflow_mode() const { return main_bar_ != nullptr; }
+  bool is_showing_bubble() const { return is_showing_bubble_; }
 
   ToolbarActionsBarDelegate* delegate_for_test() { return delegate_; }
 
   // During testing we can disable animations by setting this flag to true,
   // so that the bar resizes instantly, instead of having to poll it while it
   // animates to open/closed status.
   static bool disable_animations_for_testing_;
   static void set_extension_bubble_appearance_wait_time_for_testing(
       int time_in_seconds);
 
@@ skipping 24 matching lines @@
 
   // Returns the current web contents.
   content::WebContents* GetCurrentWebContents();
 
   // Reorders the toolbar actions to reflect the model and, optionally, to
   // "pop out" any overflowed actions that want to run (depending on the
   // value of |pop_out_actions_to_run|.
   void ReorderActions();
 
   // Shows an extension message bubble, if any should be shown.
-  void MaybeShowExtensionBubble(
-      std::unique_ptr<extensions::ExtensionMessageBubbleController> controller);
+  void MaybeShowExtensionBubble();
 
   // The delegate for this object (in a real build, this is the view).
   ToolbarActionsBarDelegate* delegate_;
 
   // The associated browser.
   Browser* browser_;
 
   // The observed toolbar model.
   ToolbarActionsModel* model_;
 
@@ skipping 57 matching lines @@
   ScopedObserver<TabStripModel, TabStripModelObserver> tab_strip_observer_;
 
   base::ObserverList<ToolbarActionsBarObserver> observers_;
 
   base::WeakPtrFactory<ToolbarActionsBar> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ToolbarActionsBar);
 };
 
 #endif  // CHROME_BROWSER_UI_TOOLBAR_TOOLBAR_ACTIONS_BAR_H_