Add throbber and status text to WebBluetooth chooser UI on non-Mac desktops

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 32 matching lines @@
 class TableViewController : public ChooserController::Observer {
  public:
   TableViewController(ChooserController* chooser_controller,
                       NSTableView* table_view);
   ~TableViewController() override;
 
   // ChooserController::Observer:
   void OnOptionsInitialized() override;
   void OnOptionAdded(size_t index) override;
   void OnOptionRemoved(size_t index) override;
+  void OnAdapterEnabledChanged(bool enabled) override;
+  void OnRefreshStateChanged(bool refreshing) override;
 
   void UpdateTableView();
 
  private:
   ChooserController* chooser_controller_;
   NSTableView* table_view_;
 
   DISALLOW_COPY_AND_ASSIGN(TableViewController);
 };
 
@@ skipping 28 matching lines @@
   if (selected_row == idx)
     [table_view_ deselectRow:idx];
   else if (selected_row > idx)
     [table_view_
             selectRowIndexes:[NSIndexSet indexSetWithIndex:selected_row - 1]
         byExtendingSelection:NO];
 
   UpdateTableView();
 }
 
+void TableViewController::OnAdapterEnabledChanged(bool enabled) {}
+
+void TableViewController::OnRefreshStateChanged(bool refreshing) {}
+
 void TableViewController::UpdateTableView() {
   [table_view_ setEnabled:chooser_controller_->NumOptions() > 0];
   [table_view_ reloadData];
 }
 
 @implementation ChooserContentViewCocoa
 
 - (instancetype)initWithChooserTitle:(NSString*)chooserTitle
                    chooserController:
                        (std::unique_ptr<ChooserController>)chooserController {
@@ skipping 250 matching lines @@
 
 - (void)close {
   chooserController_->Close();
 }
 
 - (void)onHelpPressed:(id)sender {
   chooserController_->OpenHelpCenterUrl();
 }
 
 @end