Add ability for a BubbleReference to update the BubbleUI.

components/bubble/bubble_manager.h

Index: components/bubble/bubble_manager.h
diff --git a/components/bubble/bubble_manager.h b/components/bubble/bubble_manager.h
index 931e74c97e53b8d7c9d89fe6b14ae4c6df4793f0..35f49a0bfb7c7db6b483e744fa383174ac5d3eab 100644
--- a/components/bubble/bubble_manager.h
+++ b/components/bubble/bubble_manager.h
@@ -38,6 +38,10 @@ class BubbleManager {
   // Notify all bubbles that their anchor or parent may have changed.
   void UpdateAllBubbleAnchors();
 
+  // Notify a bubble that it should update its UI.
+  // Returns true if the UI was updated.
+  bool UpdateBubbleUI(BubbleReference bubble);
+
  private:
   enum ManagerStates {
     SHOW_BUBBLES,