Added bluetooth LE support on Mac platform

device/bluetooth/bluetooth_low_energy_discovery_manager_mac.h

+// Copyright 2015 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 DEVICE_BLUETOOTH_BLUETOOTH_LOW_ENERGY_DISCOVERY_MANAGER_MAC_H_
+#define DEVICE_BLUETOOTH_BLUETOOTH_LOW_ENERGY_DISCOVERY_MANAGER_MAC_H_
+
+#if TARGET_IPHONE_SIMULATOR || TARGET_OS_IPHONE

[Avi (use Gerrit), 2015/01/29 05:25:02]

ditto

[dvh, 2015/01/30 22:45:45]

Done.

+#import <CoreBluetooth/CoreBluetooth.h>
+#else
+#import <IOBluetooth/IOBluetooth.h>
+#endif
+
+#include "base/mac/scoped_nsobject.h"
+

[Avi (use Gerrit), 2015/01/29 05:25:02]

no blank line

[dvh, 2015/01/30 22:45:45]

Done.

+#include "device/bluetooth/bluetooth_device.h"
+
+@class BluetoothLowEnergyDiscoveryManagerMacBridge;
+
+namespace device {
+
+class BluetoothLowEnergyDeviceMac;
+class BluetoothLowEnergyDiscoveryManagerMacDelegate;
+
+// This class will scan for bluetooth LE device on Mac.

[Avi (use Gerrit), 2015/01/29 05:25:02]

Bluetooth is capitalized

[dvh, 2015/01/30 22:45:45]

Done.

+class BluetoothLowEnergyDiscoveryManagerMac {
+ public:
+  // Interface for being notified of events during a device discovery session.
+  class Observer {
+   public:
+    // Called when |this| manager has found a device.
+    virtual void DeviceFound(BluetoothLowEnergyDeviceMac* device) = 0;
+
+    // Called when |this| manager has updated on a device.
+    virtual void DeviceUpdated(BluetoothLowEnergyDeviceMac* device) = 0;

[Avi (use Gerrit), 2015/01/29 05:25:02]

This interface _must_ have a virtual destructor.

[dvh, 2015/01/30 22:45:45]

is BluetoothDiscoveryManagerMac::Observer wrong as well?

[Avi (use Gerrit), 2015/01/30 23:18:31]

Yes, it is. The style guide in "Interfaces"
http://google-styleguide.googlecode.com/svn/trunk/cppguide.html#Interfaces says:

"To make sure all implementations of the interface can be destroyed correctly,
the interface must also declare a virtual destructor."

If you could take care of BluetoothDiscoveryManagerMac::Observer, that would be
great.

+  };
+
+  virtual ~BluetoothLowEnergyDiscoveryManagerMac();
+
+  // Returns true, if discovery is currently being performed.
+  virtual bool IsDiscovering() const;
+
+  // Initiates a discovery session.
+  // BluetoothLowEnergyDeviceMac objects discovered within a previous
+  // discovery session will be invalid.
+  virtual void StartDiscovery(BluetoothDevice::UUIDList services_uuids);
+
+  // Stops a discovery session.
+  virtual void StopDiscovery();
+
+  // Returns a new BluetoothLowEnergyDiscoveryManagerMac.
+  static BluetoothLowEnergyDiscoveryManagerMac* Create(Observer* observer);
+
+ protected:
+  // Called when a discovery or an update of a BLE device occurred.
+  virtual void DiscoveredPeripheral(CBPeripheral* peripheral,
+                                    NSDictionary* advertisementData,
+                                    int rssi);
+
+  // The device discovery can really be started when bluetooth is powered on.

[Avi (use Gerrit), 2015/01/29 05:25:02]

Bluetooth is capitalized.

[dvh, 2015/01/30 22:45:45]

Done.

+  // The method TryStartDiscovery() is called when it's a good time to try to
+  // start the BLE device discovery. It will check if the discovery session has
+  // been started and if the bluetooth is powered and then really start the

[Avi (use Gerrit), 2015/01/29 05:25:02]

Capital B.

[dvh, 2015/01/30 22:45:45]

Done.

+  // CoreBluetooth BLE device discovery.
+  virtual void TryStartDiscovery();
+
+ private:
+  explicit BluetoothLowEnergyDiscoveryManagerMac(Observer* observer);
+  void ClearDevices();
+
+  friend class BluetoothLowEnergyDiscoveryManagerMacDelegate;
+
+  // Observer interested in notifications from us.
+  Observer* observer_;
+
+  // Underlaying CoreBluetooth central manager.
+  base::scoped_nsobject<CBCentralManager> manager_;
+
+  // Discovery has been initiated by calling the API StartDiscovery().
+  bool discovering_;
+
+  // A discovery has been initiated but has not started yet because it's
+  // waiting for bluetooth to turn on.
+  bool pending_;
+
+  // Delegate of the central manager.
+  base::scoped_nsobject<BluetoothLowEnergyDiscoveryManagerMacBridge> bridge_;
+
+  // Map of the device identifiers to the discovered device.
+  std::map<const std::string, BluetoothLowEnergyDeviceMac*> devices_;
+
+  // List of service UUIDs to scan.
+  BluetoothDevice::UUIDList services_uuids_;
+
+  DISALLOW_COPY_AND_ASSIGN(BluetoothLowEnergyDiscoveryManagerMac);
+};
+
+}  // namespace device
+
+#endif  // DEVICE_BLUETOOTH_BLUETOOTH_LOW_ENERGY_DISCOVERY_MANAGER_MAC_H_