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

chrome/browser/usb/usb_chooser_controller.cc

Index: chrome/browser/usb/usb_chooser_controller.cc
diff --git a/chrome/browser/usb/usb_chooser_controller.cc b/chrome/browser/usb/usb_chooser_controller.cc
index 52c64d23e2d8cd806c0c4579495924b88b3b5d53..34f2ed80fc8d4662e0882eb9aa1986cfce7935a8 100644
--- a/chrome/browser/usb/usb_chooser_controller.cc
+++ b/chrome/browser/usb/usb_chooser_controller.cc
@@ -73,6 +73,10 @@ UsbChooserController::~UsbChooserController() {
     callback_.Run(nullptr);
 }
 
+base::string16 UsbChooserController::GetNoOptionsText() const {
+  return l10n_util::GetStringUTF16(IDS_DEVICE_CHOOSER_NO_DEVICES_FOUND_PROMPT);
+}
+
 base::string16 UsbChooserController::GetOkButtonLabel() const {
   return l10n_util::GetStringUTF16(IDS_USB_DEVICE_CHOOSER_CONNECT_BUTTON_TEXT);
 }
@@ -93,6 +97,12 @@ base::string16 UsbChooserController::GetOption(size_t index) const {
                    devices_[index].first->serial_number());
 }
 
+void UsbChooserController::RefreshOptions() {}
+
+base::string16 UsbChooserController::GetStatus() const {
+  return base::string16();
+}
+
 void UsbChooserController::Select(size_t index) {
   DCHECK_LT(index, devices_.size());
   content::WebContents* web_contents =