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

chrome/browser/ui/cocoa/chooser_content_view_cocoa.h

 // 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.
 
 #ifndef CHROME_BROWSER_UI_COCOA_CHOOSER_CONTENT_VIEW_COCOA_H_
 #define CHROME_BROWSER_UI_COCOA_CHOOSER_CONTENT_VIEW_COCOA_H_
 
 #import <Cocoa/Cocoa.h>
 
 #include <memory>
@@ skipping 46 matching lines @@
 // Creates a text field with |text|.
 - (base::scoped_nsobject<NSTextField>)createTextField:(NSString*)text;
 
 // Creates a hyperlink button with |text|.
 - (base::scoped_nsobject<NSButton>)createHyperlinkButtonWithText:
     (NSString*)text;
 
 // Gets the table view for the chooser.
 - (NSTableView*)tableView;
 
+// Gets the spinner.
+- (SpinnerView*)spinner;
+
+// Gets the status text field.
+- (NSTextField*)status;
+
+// Gets the "Re-scan" button.
+- (NSButton*)rescanButton;
+
 // Gets the "Connect" button.
 - (NSButton*)connectButton;
 
 // Gets the "Cancel" button.
 - (NSButton*)cancelButton;
 
 // Gets the "Get help" button.
 - (NSButton*)helpButton;
 
 // The number of options in the |tableView_|.
@@ skipping 16 matching lines @@
 
 // Called when "Re-scan" button is pressed.
 - (void)onRescan:(id)sender;
 
 // Called when the "Get help" button is pressed.
 - (void)onHelpPressed:(id)sender;
 
 @end
 
 #endif  // CHROME_BROWSER_UI_COCOA_CHOOSER_CONTENT_VIEW_COCOA_H_