Add spinner UI to show bluetooth is discovering devices.

ash/system/bluetooth/tray_bluetooth.cc

 // Copyright (c) 2012 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.
 
 #include "ash/system/bluetooth/tray_bluetooth.h"
 
 #include "ash/shell.h"
 #include "ash/system/tray/system_tray.h"
 #include "ash/system/tray/system_tray_delegate.h"
 #include "ash/system/tray/system_tray_notifier.h"
@@ skipping 85 matching lines @@
   void CreateItems() {
     CreateScrollableList();
     AppendSettingsEntries();
     AppendHeaderEntry();
   }
 
   void BluetoothStartDiscovering() {
     ash::SystemTrayDelegate* delegate =
         ash::Shell::GetInstance()->system_tray_delegate();
     bool bluetooth_enabled = delegate->GetBluetoothEnabled();
-    if (!bluetooth_discovering_ && bluetooth_enabled)
+    if (!bluetooth_discovering_ && bluetooth_enabled) {
       delegate->BluetoothStartDiscovering();
+      throbber_->Start();
+    } else if(!bluetooth_enabled) {
+      throbber_->Stop();
+    }
     bluetooth_discovering_ = bluetooth_enabled;
   }
 
   void BluetoothStopDiscovering() {
     ash::SystemTrayDelegate* delegate =
         ash::Shell::GetInstance()->system_tray_delegate();
     if (bluetooth_discovering_) {
       bluetooth_discovering_ = false;
       delegate->BluetoothStopDiscovering();
+      throbber_->Stop();
     }
   }
 
   void UpdateBlueToothDeviceList() {
     connected_devices_.clear();
     paired_not_connected_devices_.clear();
     discovered_not_paired_devices_.clear();
     BluetoothDeviceList list;
     Shell::GetInstance()->system_tray_delegate()->
         GetAvailableBluetoothDevices(&list);
     for (size_t i = 0; i < list.size(); ++i) {
       if (list[i].connected)
         connected_devices_.push_back(list[i]);
       else if (list[i].paired)
         paired_not_connected_devices_.push_back(list[i]);
       else if (list[i].visible)
         discovered_not_paired_devices_.push_back(list[i]);
     }
   }
 
   void AppendHeaderEntry() {
     CreateSpecialRow(IDS_ASH_STATUS_TRAY_BLUETOOTH, this);
 
     if (login_ == user::LOGGED_IN_LOCKED)
       return;
 
+    throbber_ = new ThrobberView;
+    throbber_->SetTooltipText(
+        l10n_util::GetStringUTF16(IDS_ASH_STATUS_TRAY_BLUETOOTH_DISCOVERING));
+    footer()->AddThrobber(throbber_);
+
     // Do not allow toggling bluetooth in the lock screen.
     ash::SystemTrayDelegate* delegate =
         ash::Shell::GetInstance()->system_tray_delegate();
     toggle_bluetooth_ = new TrayPopupHeaderButton(this,
         IDR_AURA_UBER_TRAY_BLUETOOTH_ENABLED,
         IDR_AURA_UBER_TRAY_BLUETOOTH_DISABLED,
         IDR_AURA_UBER_TRAY_BLUETOOTH_ENABLED_HOVER,
         IDR_AURA_UBER_TRAY_BLUETOOTH_DISABLED_HOVER,
         IDS_ASH_STATUS_TRAY_BLUETOOTH);
     toggle_bluetooth_->SetToggled(!delegate->GetBluetoothEnabled());
@@ skipping 162 matching lines @@
     if (sender == toggle_bluetooth_)
       delegate->ToggleBluetooth();
     else
       NOTREACHED();
   }
 
   user::LoginStatus login_;
 
   std::map<views::View*, std::string> device_map_;
   views::View* add_device_;
+  ThrobberView* throbber_;
   TrayPopupHeaderButton* toggle_bluetooth_;
   HoverHighlightView* enable_bluetooth_;
   BluetoothDeviceList connected_devices_;
   BluetoothDeviceList paired_not_connected_devices_;
   BluetoothDeviceList discovered_not_paired_devices_;
   bool bluetooth_discovering_;
 
   DISALLOW_COPY_AND_ASSIGN(BluetoothDetailedView);
 };
 
@@ skipping 50 matching lines @@
 }
 
 void TrayBluetooth::OnBluetoothDiscoveringChanged() {
   if (!detailed_)
     return;
   detailed_->Update();
 }
 
 }  // namespace internal
 }  // namespace ash