[Extensions UI] Handle multiple warning bubbles racing to show

chrome/browser/extensions/extension_message_bubble_controller.h

Index: chrome/browser/extensions/extension_message_bubble_controller.h
diff --git a/chrome/browser/extensions/extension_message_bubble_controller.h b/chrome/browser/extensions/extension_message_bubble_controller.h
index f125d481d22a3f5503f788793e0de01f4673ce05..63e828ddab86a15e1c408b58cd87a013d6e6325a 100644
--- a/chrome/browser/extensions/extension_message_bubble_controller.h
+++ b/chrome/browser/extensions/extension_message_bubble_controller.h
@@ -18,6 +18,7 @@
 class Browser;
 class BrowserList;
 class ExtensionService;
+class ToolbarActionsModel;
 class Profile;
 
 namespace extensions {
@@ -160,6 +161,9 @@ class ExtensionMessageBubbleController : public chrome::BrowserListObserver {
   virtual void OnBubbleDismiss(bool dismissed_by_deactivation);
   virtual void OnLinkClicked();
 
+  // Sets this bubble as the active bubble being shown.
+  void SetIsActiveBubble();
+
   void ClearProfileListForTesting();
 
   static void set_should_ignore_learn_more_for_testing(
@@ -183,6 +187,9 @@ class ExtensionMessageBubbleController : public chrome::BrowserListObserver {
   // A weak pointer to the Browser we are associated with. Not owned by us.
   Browser* browser_;
 
+  // The associated ToolbarActionsModel. Not owned.
+  ToolbarActionsModel* model_;
+
   // The list of extensions found.
   ExtensionIdList extension_list_;
 
@@ -198,6 +205,9 @@ class ExtensionMessageBubbleController : public chrome::BrowserListObserver {
   // Whether or not the bubble is highlighting extensions.
   bool did_highlight_;
 
+  // Whether or not this bubble is the active bubble being shown.
+  bool is_active_bubble_;
+
   ScopedObserver<BrowserList, BrowserListObserver> browser_list_observer_;
 
   DISALLOW_COPY_AND_ASSIGN(ExtensionMessageBubbleController);