Add ability for a BubbleReference to update the BubbleUI.

components/bubble/bubble_controller.cc

Index: components/bubble/bubble_controller.cc
diff --git a/components/bubble/bubble_controller.cc b/components/bubble/bubble_controller.cc
index e32cd21716428aa0845c41c6a865a6c4ff0b1849..5e045390d24cd6305324fd203c3935ced2165042 100644
--- a/components/bubble/bubble_controller.cc
+++ b/components/bubble/bubble_controller.cc
@@ -21,12 +21,20 @@ BubbleController::~BubbleController() {
 }
 
 bool BubbleController::CloseBubble(BubbleCloseReason reason) {
+  DCHECK(thread_checker_.CalledOnValidThread());
   return manager_->CloseBubble(this->AsWeakPtr(), reason);
 }
 
+bool BubbleController::UpdateBubbleUi() {
+  DCHECK(thread_checker_.CalledOnValidThread());
+  if (!bubble_ui_)
+    return false;
+  return delegate_->UpdateBubbleUi(bubble_ui_.get());
+}
+
 void BubbleController::Show() {
   DCHECK(!bubble_ui_);
-  bubble_ui_ = delegate_->BuildBubbleUI();
+  bubble_ui_ = delegate_->BuildBubbleUi();
   DCHECK(bubble_ui_);
   bubble_ui_->Show(AsWeakPtr());
   // TODO(hcarmona): log that bubble was shown.