Add test for WebBluetooth chooser spinner, status, and rescan button on Mac

chrome/browser/ui/cocoa/chooser_content_view_cocoa.mm

Index: chrome/browser/ui/cocoa/chooser_content_view_cocoa.mm
diff --git a/chrome/browser/ui/cocoa/chooser_content_view_cocoa.mm b/chrome/browser/ui/cocoa/chooser_content_view_cocoa.mm
index e7b8513ce383ba7cf09d4d941421b3eb43caa0f2..9986f0c47cfa1d215dad38e3bc1233bb1b158e0e 100644
--- a/chrome/browser/ui/cocoa/chooser_content_view_cocoa.mm
+++ b/chrome/browser/ui/cocoa/chooser_content_view_cocoa.mm
@@ -408,6 +408,18 @@ void ChooserContentViewController::UpdateTableView() {
   return tableView_.get();
 }
 
+- (SpinnerView*)spinner {
+  return spinner_.get();
+}
+
+- (NSTextField*)status {
+  return status_.get();
+}
+
+- (NSButton*)rescanButton {
+  return rescanButton_.get();
+}
+
 - (NSButton*)connectButton {
   return connectButton_.get();
 }