Added bluetooth LE support on Mac platform

device/bluetooth/bluetooth_low_energy_discovery_manager_mac.mm

Index: device/bluetooth/bluetooth_low_energy_discovery_manager_mac.mm
diff --git a/device/bluetooth/bluetooth_low_energy_discovery_manager_mac.mm b/device/bluetooth/bluetooth_low_energy_discovery_manager_mac.mm
new file mode 100644
index 0000000000000000000000000000000000000000..1d7e409c81cd864d7935326d8b8f4583cd312587
--- /dev/null
+++ b/device/bluetooth/bluetooth_low_energy_discovery_manager_mac.mm
@@ -0,0 +1,180 @@
+// 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.
+
+#include "device/bluetooth/bluetooth_low_energy_discovery_manager_mac.h"
+
+#include "base/mac/mac_util.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/strings/sys_string_conversions.h"
+#include "device/bluetooth/bluetooth_low_energy_device_mac.h"
+
+using device::BluetoothLowEnergyDeviceMac;
+using device::BluetoothLowEnergyDiscoveryManagerMac;
+using device::BluetoothLowEnergyDiscoveryManagerMacDelegate;
+
+namespace device {
+
+// This class is a helper to call some protected methods in
+// BluetoothLowEnergyDiscoveryManagerMac.
+class BluetoothLowEnergyDiscoveryManagerMacDelegate {
+ public:
+  BluetoothLowEnergyDiscoveryManagerMacDelegate(
+      BluetoothLowEnergyDiscoveryManagerMac* manager)
+      : manager_(manager) {}
+
+  virtual ~BluetoothLowEnergyDiscoveryManagerMacDelegate() {}
+
+  virtual void DiscoveredPeripheral(CBPeripheral* peripheral,
+                                    NSDictionary* advertisementData,
+                                    int rssi) {
+    manager_->DiscoveredPeripheral(peripheral, advertisementData, rssi);
+  }
+
+  virtual void TryStartDiscovery() { manager_->TryStartDiscovery(); }
+
+ private:
+  BluetoothLowEnergyDiscoveryManagerMac* manager_;
+};
+
+}  // namespace device
+
+// This class will serve as the Objective-C delegate of CBCentralManager.
+@interface BluetoothLowEnergyDiscoveryManagerMacBridge
+    : NSObject<CBCentralManagerDelegate>
+
+- (id)initWithManager:(BluetoothLowEnergyDiscoveryManagerMac*)manager;
+
+@end
+
+@implementation BluetoothLowEnergyDiscoveryManagerMacBridge {
+  BluetoothLowEnergyDiscoveryManagerMac* manager_;
+  scoped_ptr<BluetoothLowEnergyDiscoveryManagerMacDelegate> delegate_;
+}
+
+- (id)initWithManager:(BluetoothLowEnergyDiscoveryManagerMac*)manager {
+  if ((self = [super init])) {
+    manager_ = manager;
+    delegate_.reset(
+        new BluetoothLowEnergyDiscoveryManagerMacDelegate(manager_));
+  }
+  return self;
+}
+
+- (void)centralManager:(CBCentralManager*)central
+    didDiscoverPeripheral:(CBPeripheral*)peripheral
+        advertisementData:(NSDictionary*)advertisementData
+                     RSSI:(NSNumber*)RSSI {
+  // Notifies the discovery of a device.
+  delegate_->DiscoveredPeripheral(peripheral, advertisementData,
+                                  [RSSI intValue]);
+}
+
+- (void)centralManagerDidUpdateState:(CBCentralManager*)central {
+  // Notifies when the powered state of the central manager changed.
+  delegate_->TryStartDiscovery();
+}
+
+@end
+
+BluetoothLowEnergyDiscoveryManagerMac::
+    ~BluetoothLowEnergyDiscoveryManagerMac() {
+  ClearDevices();
+}
+
+bool BluetoothLowEnergyDiscoveryManagerMac::IsDiscovering() const {
+  return discovering_;
+}
+
+void BluetoothLowEnergyDiscoveryManagerMac::StartDiscovery(
+    BluetoothDevice::UUIDList services_uuids) {
+  ClearDevices();
+  discovering_ = true;
+  pending_ = true;
+  services_uuids_ = services_uuids;
+  TryStartDiscovery();
+}
+
+void BluetoothLowEnergyDiscoveryManagerMac::TryStartDiscovery() {
+  if (!discovering_) {
+    return;
+  }
+
+  if (!pending_) {
+    return;
+  }
+
+  // Can only start if the bluetooth power is turned on.
+  if ([manager_ state] != CBCentralManagerStatePoweredOn) {
+    return;
+  }
+
+  // Converts the services UUIDs to a CoreBluetooth data structure.
+  NSMutableArray* services = nil;
+  if (!services_uuids_.empty()) {
+    services = [NSMutableArray array];
+    for (auto& service_uuid : services_uuids_) {
+      NSString* uuidString =
+          base::SysUTF8ToNSString(service_uuid.canonical_value().c_str());
+      CBUUID* uuid = [CBUUID UUIDWithString:uuidString];
+      [services addObject:uuid];
+    }
+  }
+
+  [manager_ scanForPeripheralsWithServices:services options:nil];
+  pending_ = false;
+}
+
+void BluetoothLowEnergyDiscoveryManagerMac::StopDiscovery() {
+  if (discovering_ && !pending_) {
+    [manager_ stopScan];
+  }
+  discovering_ = false;
+}
+
+void BluetoothLowEnergyDiscoveryManagerMac::DiscoveredPeripheral(
+    CBPeripheral* peripheral,
+    NSDictionary* advertisementData,
+    int rssi) {
+  // Look for existing device.
+  auto iter = devices_.find(
+      BluetoothLowEnergyDeviceMac::GetPeripheralIdentifier(peripheral));
+  if (iter == devices_.end()) {
+    // A device has been added.
+    BluetoothLowEnergyDeviceMac* device =
+        new BluetoothLowEnergyDeviceMac(peripheral, advertisementData, rssi);
+    devices_.insert(devices_.begin(),
+                    std::make_pair(device->GetIdentifier(), device));
+    observer_->DeviceFound(device);
+    return;
+  }
+
+  // A device has an update.
+  BluetoothLowEnergyDeviceMac* old_device = iter->second;
+  old_device->Update(peripheral, advertisementData, rssi);
+  observer_->DeviceUpdated(old_device);
+}
+
+BluetoothLowEnergyDiscoveryManagerMac*
+BluetoothLowEnergyDiscoveryManagerMac::Create(Observer* observer) {
+  return new BluetoothLowEnergyDiscoveryManagerMac(observer);
+}
+
+BluetoothLowEnergyDiscoveryManagerMac::BluetoothLowEnergyDiscoveryManagerMac(
+    Observer* observer)
+    : observer_(observer) {
+  bridge_.reset([[BluetoothLowEnergyDiscoveryManagerMacBridge alloc]
+      initWithManager:this]);
+  // Since CoreBluetooth is only available on OS X 10.7 or later, we
+  // instantiate CBCentralManager only for OS X >= 10.7.
+  if (base::mac::IsOSLionOrLater()) {
+    manager_.reset(
+        [[CBCentralManager alloc] initWithDelegate:bridge_
+                                             queue:dispatch_get_main_queue()]);
+  }
+  discovering_ = false;
+}
+
+void BluetoothLowEnergyDiscoveryManagerMac::ClearDevices() {
+  STLDeleteValues(&devices_);
+}