cros: Move TrayBluetoothHelper out of chrome into ash

ash/common/system/chromeos/bluetooth/tray_bluetooth_helper.h

 // Copyright 2017 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_ASH_TRAY_BLUETOOTH_HELPER_H_
-#define CHROME_BROWSER_UI_ASH_TRAY_BLUETOOTH_HELPER_H_
+#ifndef ASH_COMMON_SYSTEM_CHROMEOS_BLUETOOTH_TRAY_BLUETOOTH_HELPER_H_
+#define ASH_COMMON_SYSTEM_CHROMEOS_BLUETOOTH_TRAY_BLUETOOTH_HELPER_H_
 
 #include <memory>
 #include <vector>
 
+#include "ash/ash_export.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
 #include "device/bluetooth/bluetooth_adapter.h"
 
-namespace ash {
-struct BluetoothDeviceInfo;
-}
-
 namespace device {
 class BluetoothDiscoverySession;
 }
 
+namespace ash {
+
+struct BluetoothDeviceInfo;
+
 // Maps UI concepts from the Bluetooth system tray (e.g. "Bluetooth is on") into
 // device concepts ("Bluetooth adapter enabled"). Note that most Bluetooth
 // device operations are asynchronous, hence the two step initialization.
-// TODO(jamescook): Move into //ash/system next to TrayBluetooth. This isn't
-// named "delegate" because long-term there should not be any delegation.
-class TrayBluetoothHelper : public device::BluetoothAdapter::Observer {
+// Exported for test.
+class ASH_EXPORT TrayBluetoothHelper
+    : public device::BluetoothAdapter::Observer {
  public:
   TrayBluetoothHelper();
   ~TrayBluetoothHelper() override;
 
-  // Called after SystemTray has been instantiated.
+  // Initializes and gets the adapter asynchronously.
   void Initialize();
 
   // Completes initialization after the Bluetooth adapter is ready.
   void InitializeOnAdapterReady(
       scoped_refptr<device::BluetoothAdapter> adapter);
 
   // Returns a list of available bluetooth devices.
   // TODO(jamescook): Just return the list.
-  void GetAvailableDevices(std::vector<ash::BluetoothDeviceInfo>* list);
+  void GetAvailableDevices(std::vector<BluetoothDeviceInfo>* list);
 
   // Requests bluetooth start discovering devices, which happens asynchronously.
   void StartDiscovering();
 
   // Requests bluetooth stop discovering devices.
   void StopDiscovering();
 
   // Connect to a specific bluetooth device.
   void ConnectToDevice(const std::string& address);
 
@@ skipping 35 matching lines @@
   bool should_run_discovery_ = false;
   scoped_refptr<device::BluetoothAdapter> adapter_;
   std::unique_ptr<device::BluetoothDiscoverySession> discovery_session_;
 
   // Object could be deleted during a prolonged Bluetooth operation.
   base::WeakPtrFactory<TrayBluetoothHelper> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(TrayBluetoothHelper);
 };
 
-#endif  // CHROME_BROWSER_UI_ASH_TRAY_BLUETOOTH_HELPER_H_
+}  // namespace ash
+
+#endif  // ASH_COMMON_SYSTEM_CHROMEOS_BLUETOOTH_TRAY_BLUETOOTH_HELPER_H_