Pass a BubbleReference to BubbleUI::Show.

components/bubble/bubble_ui.h

Index: components/bubble/bubble_ui.h
diff --git a/components/bubble/bubble_ui.h b/components/bubble/bubble_ui.h
index 5c52f4fb0675cc144dfce7a86437709761ea89b0..d887fb7228901c18bf7b2ed879c6d50e6d4220e3 100644
--- a/components/bubble/bubble_ui.h
+++ b/components/bubble/bubble_ui.h
@@ -5,12 +5,15 @@
 #ifndef COMPONENTS_BUBBLE_BUBBLE_UI_H_
 #define COMPONENTS_BUBBLE_BUBBLE_UI_H_
 
+#include "components/bubble/bubble_reference.h"
+
 class BubbleUI {
  public:
   virtual ~BubbleUI() {}
 
-  // Should display the bubble UI.
-  virtual void Show() = 0;
+  // Should display the bubble UI. BubbleReference is passed in so that the
+  // bubble UI can notify the BubbleManager if it needs to close.
+  virtual void Show(BubbleReference bubble_reference) = 0;
 
   // Should close the bubble UI.
   virtual void Close() = 0;