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

chrome/browser/ui/bluetooth/bluetooth_chooser_controller.h

Index: chrome/browser/ui/bluetooth/bluetooth_chooser_controller.h
diff --git a/chrome/browser/ui/bluetooth/bluetooth_chooser_controller.h b/chrome/browser/ui/bluetooth/bluetooth_chooser_controller.h
index deb2caa0d51ff883dca2280a269a90596a17cc2c..9e79f2a960f11e52573e8192727f672e96a27563 100644
--- a/chrome/browser/ui/bluetooth/bluetooth_chooser_controller.h
+++ b/chrome/browser/ui/bluetooth/bluetooth_chooser_controller.h
@@ -31,11 +31,22 @@ class BluetoothChooserController : public ChooserController {
   base::string16 GetOkButtonLabel() const override;
   size_t NumOptions() const override;
   base::string16 GetOption(size_t index) const override;
+  void RefreshOptions() override;
+  bool NeedsThrobber() const override;
+  bool NeedsStatus() const override;
   void Select(size_t index) override;
   void Cancel() override;
   void Close() override;
   void OpenHelpCenterUrl() const override;
 
+  // Update the state of the Bluetooth adapter.
+  void UpdateAdapterPresence(
+      content::BluetoothChooser::AdapterPresence presence);
+
+  // Update the Bluetooth discovery state and let the user know whether
+  // discovery is happening.
+  void UpdateDiscoveryState(content::BluetoothChooser::DiscoveryState state);
+
   // Shows a new device in the chooser.
   void AddDevice(const std::string& device_id,
                  const base::string16& device_name);
@@ -44,6 +55,10 @@ class BluetoothChooserController : public ChooserController {
   void RemoveDevice(const std::string& device_id);
 
  private:
+  // Clears |device_names_and_ids_| and |device_name_map_|. Called when
+  // Bluetooth adapter is turned on or off, or when re-scan happens.
+  void ClearAllDevices();
+
   // Each pair is a (device name, device id).
   std::vector<std::pair<base::string16, std::string>> device_names_and_ids_;
   content::BluetoothChooser::EventHandler event_handler_;