[Extensions UI] Handle multiple warning bubbles racing to show

chrome/browser/ui/toolbar/toolbar_actions_model.h

Index: chrome/browser/ui/toolbar/toolbar_actions_model.h
diff --git a/chrome/browser/ui/toolbar/toolbar_actions_model.h b/chrome/browser/ui/toolbar/toolbar_actions_model.h
index b3029ec8bc11e8a789d7d5add0bda3515ee80e43..b8b99d536d65d794271752be8f3c83fc5d9e60fa 100644
--- a/chrome/browser/ui/toolbar/toolbar_actions_model.h
+++ b/chrome/browser/ui/toolbar/toolbar_actions_model.h
@@ -29,6 +29,7 @@ class ToolbarActionViewController;
 
 namespace extensions {
 class ExtensionActionManager;
+class ExtensionMessageBubbleController;
 class ExtensionRegistry;
 class ExtensionSet;
 }
@@ -172,6 +173,11 @@ class ToolbarActionsModel
   bool is_highlighting() const { return highlight_type_ != HIGHLIGHT_NONE; }
   HighlightType highlight_type() const { return highlight_type_; }
 
+  bool has_active_bubble() const { return has_active_bubble_; }
+  void set_has_active_bubble(bool has_active_bubble) {
+    has_active_bubble_ = has_active_bubble;
+  }
+
   void SetActionVisibility(const std::string& action_id, bool visible);
 
   // ComponentMigrationHelper::ComponentActionDelegate:
@@ -193,6 +199,11 @@ class ToolbarActionsModel
   // number of visible icons will be reset to what it was before highlighting.
   void StopHighlighting();
 
+  // Gets the ExtensionMessageBubbleController that should be shown for this
+  // profile, if any.
+  std::unique_ptr<extensions::ExtensionMessageBubbleController>
+  GetExtensionMessageBubbleController(Browser* browser);
+
  private:
   // Callback when actions are ready.
   void OnReady();
@@ -312,6 +323,10 @@ class ToolbarActionsModel
   // visible, instead of overloading this one.
   int visible_icon_count_;
 
+  // Whether or not there is an active ExtensionMessageBubbleController
+  // associated with the profile. There should only be one at a time.
+  bool has_active_bubble_;
+
   ScopedObserver<extensions::ExtensionActionAPI,
                  extensions::ExtensionActionAPI::Observer>
       extension_action_observer_;