Add ability for a BubbleReference to update the BubbleUI.

components/bubble/bubble_delegate.cc

Index: components/bubble/bubble_delegate.cc
diff --git a/components/bubble/bubble_delegate.cc b/components/bubble/bubble_delegate.cc
index 110d93f281cf506a2cb1aba0c8e20bc269fe0492..7bcc47df2fc0df93b5aaba545ee77d22d5440ffd 100644
--- a/components/bubble/bubble_delegate.cc
+++ b/components/bubble/bubble_delegate.cc
@@ -11,3 +11,7 @@ BubbleDelegate::~BubbleDelegate() {}
 bool BubbleDelegate::ShouldClose(BubbleCloseReason reason) {
   return true;
 }
+
+bool BubbleDelegate::UpdateBubbleUI(BubbleUI* bubble_ui) {
+  return false;
+}