[rAC] Do not re-create bubble window unnecessarily

chrome/browser/ui/cocoa/autofill/autofill_details_container.mm

Index: chrome/browser/ui/cocoa/autofill/autofill_details_container.mm
diff --git a/chrome/browser/ui/cocoa/autofill/autofill_details_container.mm b/chrome/browser/ui/cocoa/autofill/autofill_details_container.mm
index 633bdf2342ccf1ae36a60e68948b74d4e1d8fb0b..ec03925056f6abdd70c5427611b150aa9427e16e 100644
--- a/chrome/browser/ui/cocoa/autofill/autofill_details_container.mm
+++ b/chrome/browser/ui/cocoa/autofill/autofill_details_container.mm
@@ -100,6 +100,14 @@ typedef BOOL (^FieldFilterBlock)(NSView<AutofillInputField>*);
 }
 
 - (BOOL)validate {
+  // Account for a subtle timing issue. -validate is called from the dialog's
+  // -accept. -accept then hides the dialog. If the data does not validate the
+  // dialog is then reshown, focusing on the first invalid field. This happens
+  // without running the message loop, so windowWillClose has not fired when
+  // the dialog and error bubble is reshown, leading to a missing error bubble.
+  // Resetting the anchor view here forces the bubble to show.
+  errorBubbleAnchorView_ = nil;
+
   bool allValid = true;
   for (AutofillSectionContainer* details in details_.get()) {
     if (![[details view] isHidden])
@@ -156,9 +164,17 @@ typedef BOOL (^FieldFilterBlock)(NSView<AutofillInputField>*);
                     name:NSWindowWillCloseNotification
                   object:[errorBubbleController_ window]];
   errorBubbleController_ = nil;
+  errorBubbleAnchorView_ = nil;
 }
 
 - (void)showErrorBubbleForField:(NSControl<AutofillInputField>*)field {
+  // If there is already a bubble controller handling this field, reuse.
+  if (errorBubbleController_ && errorBubbleAnchorView_ == field) {
+    [errorBubbleController_ setMessage:[field validityMessage]];
+
+    return;
+  }
+
   if (errorBubbleController_)
     [errorBubbleController_ close];
   DCHECK(!errorBubbleController_);
@@ -203,6 +219,7 @@ typedef BOOL (^FieldFilterBlock)(NSView<AutofillInputField>*);
   [errorBubbleController_ setAnchorPoint:
       [parentWindow convertBaseToScreen:anchorPoint]];
 
+  errorBubbleAnchorView_ = field;
   [errorBubbleController_ showWindow:self];
 }