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

chrome/browser/ui/cocoa/chooser_content_view_cocoa.mm

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #import "chrome/browser/ui/cocoa/chooser_content_view_cocoa.h"
 
 #include <algorithm>
 
 #include "base/macros.h"
 #include "base/strings/sys_string_conversions.h"
@@ skipping 390 matching lines @@
       [[HyperlinkButtonCell alloc] initTextCell:text]);
   [button setCell:cell.get()];
   [button sizeToFit];
   return button;
 }
 
 - (NSTableView*)tableView {
   return tableView_.get();
 }
 
+- (SpinnerView*)spinner {
+  return spinner_.get();
+}
+
+- (NSTextField*)status {
+  return status_.get();
+}
+
+- (NSButton*)rescanButton {
+  return rescanButton_.get();
+}
+
 - (NSButton*)connectButton {
   return connectButton_.get();
 }
 
 - (NSButton*)cancelButton {
   return cancelButton_.get();
 }
 
 - (NSButton*)helpButton {
   return helpButton_.get();
@@ skipping 39 matching lines @@
 
 - (void)onRescan:(id)sender {
   chooserController_->RefreshOptions();
 }
 
 - (void)onHelpPressed:(id)sender {
   chooserController_->OpenHelpCenterUrl();
 }
 
 @end