[Extensions UI Mac] Fix race condition in showing the icon surfacing bubble

chrome/browser/extensions/browser_action_test_util.h

Index: chrome/browser/extensions/browser_action_test_util.h
diff --git a/chrome/browser/extensions/browser_action_test_util.h b/chrome/browser/extensions/browser_action_test_util.h
index a95bef64007f7235734dfbc67b615f9b72cc7336..04925c1b801db3224581cd15c5051961efd9714d 100644
--- a/chrome/browser/extensions/browser_action_test_util.h
+++ b/chrome/browser/extensions/browser_action_test_util.h
@@ -94,6 +94,10 @@ class BrowserActionTestUtil {
   // is too small for the preferred width.
   void SetWidth(int width);
 
+  // Returns true if the container is currently highlighting in preparation for
+  // showing the icon surfacing bubble.
+  bool IsHighlightingForSurfacingBubble();
+
   // Returns the ToolbarActionsBar.
   ToolbarActionsBar* GetToolbarActionsBar();