cros: Extract TrayBluetoothHelper from SystemTrayDelegateChromeOS

chrome/browser/ui/ash/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_
+
+#include <memory>
+#include <vector>
+
+#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 chromeos {
+class SystemTrayDelegateChromeOS;
+}
+
+namespace device {
+class BluetoothDiscoverySession;
+}
+
+// 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 {
+ public:
+  explicit TrayBluetoothHelper(
+      chromeos::SystemTrayDelegateChromeOS* system_tray_delegate);
+  ~TrayBluetoothHelper() override;
+
+  // Called after SystemTray has been instantiated.
+  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);
+
+  // 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);
+
+  // Returns true if bluetooth adapter is discovering bluetooth devices.
+  bool IsDiscovering() const;
+
+  // Toggles whether bluetooth is enabled.
+  void ToggleEnabled();
+
+  // Returns whether bluetooth capability is available (e.g. the device has
+  // hardware support).
+  bool GetAvailable();
+
+  // Returns whether bluetooth is enabled.
+  bool GetEnabled();
+
+  // Returns whether the delegate has initiated a bluetooth discovery session.
+  // TODO(jamescook): Why do we need both this and IsDiscovering()?
+  bool HasDiscoverySession();
+
+  // BluetoothAdapter::Observer:
+  void AdapterPresentChanged(device::BluetoothAdapter* adapter,
+                             bool present) override;
+  void AdapterPoweredChanged(device::BluetoothAdapter* adapter,
+                             bool powered) override;
+  void AdapterDiscoveringChanged(device::BluetoothAdapter* adapter,
+                                 bool discovering) override;
+  void DeviceAdded(device::BluetoothAdapter* adapter,
+                   device::BluetoothDevice* device) override;
+  void DeviceChanged(device::BluetoothAdapter* adapter,
+                     device::BluetoothDevice* device) override;
+  void DeviceRemoved(device::BluetoothAdapter* adapter,
+                     device::BluetoothDevice* device) override;
+
+ private:
+  void OnStartDiscoverySession(
+      std::unique_ptr<device::BluetoothDiscoverySession> discovery_session);
+
+  // TODO: Eliminate this after verifying the initialization order of
+  // SystemTrayDelegateChromeOS can be changed.
+  chromeos::SystemTrayDelegateChromeOS* const system_tray_delegate_;
+
+  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_