[autofill] Avoid duplicate instances of the SaveCardBubble.

chrome/browser/ui/autofill/save_card_bubble_controller_impl.cc

Index: chrome/browser/ui/autofill/save_card_bubble_controller_impl.cc
diff --git a/chrome/browser/ui/autofill/save_card_bubble_controller_impl.cc b/chrome/browser/ui/autofill/save_card_bubble_controller_impl.cc
index 78ad6a87fb6a953410398313be68585b138f2c21..fa59df070b1b11a3bcd26e15a2b9995c37aad2cc 100644
--- a/chrome/browser/ui/autofill/save_card_bubble_controller_impl.cc
+++ b/chrome/browser/ui/autofill/save_card_bubble_controller_impl.cc
@@ -47,6 +47,10 @@ SaveCardBubbleControllerImpl::~SaveCardBubbleControllerImpl() {
 void SaveCardBubbleControllerImpl::ShowBubbleForLocalSave(
     const CreditCard& card,
     const base::Closure& save_card_callback) {
+  // Don't show the bubble if it's already visible.
+  if (save_card_bubble_view_)
+    return;
+
   is_uploading_ = false;
   is_reshow_ = false;
   should_cvc_be_requested_ = false;
@@ -66,6 +70,10 @@ void SaveCardBubbleControllerImpl::ShowBubbleForUpload(
     std::unique_ptr<base::DictionaryValue> legal_message,
     bool should_cvc_be_requested,
     const base::Closure& save_card_callback) {
+  // Don't show the bubble if it's already visible.
+  if (save_card_bubble_view_)
+    return;
+
   is_uploading_ = true;
   is_reshow_ = false;
   should_cvc_be_requested_ = should_cvc_be_requested;
@@ -93,6 +101,10 @@ void SaveCardBubbleControllerImpl::HideBubble() {
 }
 
 void SaveCardBubbleControllerImpl::ReshowBubble() {
+  // Don't show the bubble if it's already visible.
+  if (save_card_bubble_view_)
+    return;
+
   is_reshow_ = true;
   AutofillMetrics::LogSaveCardPromptMetric(
       AutofillMetrics::SAVE_CARD_PROMPT_SHOW_REQUESTED, is_uploading_,