Add an extension bubble explaining which extensions are in dev mode.

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

 // Copyright 2013 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_BROWSER_ACTIONS_CONTAINER_H_
 #define CHROME_BROWSER_UI_VIEWS_TOOLBAR_BROWSER_ACTIONS_CONTAINER_H_
 
 #include "chrome/browser/extensions/extension_keybinding_registry.h"
 #include "chrome/browser/extensions/extension_toolbar_model.h"
 #include "chrome/browser/ui/views/chrome_views_export.h"
@@ skipping 126 matching lines @@
   const views::View* chevron() const { return chevron_; }
 
   // Returns the profile this container is associated with.
   Profile* profile() const { return profile_; }
 
   // Get a particular browser action view.
   BrowserActionView* GetBrowserActionViewAt(int index) {
     return browser_action_views_[index];
   }
 
-  // Retrieve the BrowserActionView for |extension|.
+  // Retrieve the BrowserActionView for a certain extension |action|.
   BrowserActionView* GetBrowserActionView(ExtensionAction* action);
 
   // Update the views to reflect the state of the browser action icons.
   void RefreshBrowserActionViews();
 
   // Sets up the browser action view vector.
   void CreateBrowserActionViews();
 
   // Delete all browser action views.
   void DeleteBrowserActionViews();
@@ skipping 219 matching lines @@
 
   base::WeakPtrFactory<BrowserActionsContainer> task_factory_;
 
   // Handles delayed showing of the overflow menu when hovering.
   base::WeakPtrFactory<BrowserActionsContainer> show_menu_task_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(BrowserActionsContainer);
 };
 
 #endif  // CHROME_BROWSER_UI_VIEWS_TOOLBAR_BROWSER_ACTIONS_CONTAINER_H_