[Extensions] Make extension message bubble factory platform-abstract

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 "base/macros.h"
 #include "base/memory/scoped_vector.h"
 #include "base/scoped_observer.h"
@@ skipping 180 matching lines @@
   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();
 
   // Sets |overflowed_action_wants_to_run_| to the proper value.
   void SetOverflowedActionWantsToRun();
 
+  // Shows an extension message bubble, if any should be shown.
+  void MaybeShowExtensionBubble();
+
   bool in_overflow_mode() const { return main_bar_ != nullptr; }
 
   // The delegate for this object (in a real build, this is the view).
   ToolbarActionsBarDelegate* delegate_;
 
   // The associated browser.
   Browser* browser_;
 
   // The observed toolbar model.
   extensions::ExtensionToolbarModel* model_;
@@ skipping 29 matching lines @@
   static bool pop_out_actions_to_run_;
 
   // If set to false, notifications for OnOverflowedActionWantsToRunChanged()
   // will not be sent. Used because in unit tests there is no wrench menu to
   // alter.
   static bool send_overflowed_action_changes_;
 
   // True if an action in the overflow menu wants to run.
   bool overflowed_action_wants_to_run_;
 
+  // True if we have checked to see if there is an extension bubble to display,
+  // and done so if one exists.

[Finnur, 2015/04/10 11:24:21]

nit: This comment is very confusing. Especially the "and done so" part. :)
Can you reword it?

[Devlin, 2015/04/10 15:55:20]

Done.

+  bool checked_extension_bubble_;
+
   DISALLOW_COPY_AND_ASSIGN(ToolbarActionsBar);
 };
 
 #endif  // CHROME_BROWSER_UI_TOOLBAR_TOOLBAR_ACTIONS_BAR_H_