Bluetooth: Mac: implementation for start notification

device/bluetooth/test/mock_bluetooth_cbcharacteristic_mac.mm

Index: device/bluetooth/test/mock_bluetooth_cbcharacteristic_mac.mm
diff --git a/device/bluetooth/test/mock_bluetooth_cbcharacteristic_mac.mm b/device/bluetooth/test/mock_bluetooth_cbcharacteristic_mac.mm
index bbe31d92dbad7a89daa8dec9494c7c169058cf28..be7a3f2cc43e1d0989006339dcda9cf0159c7af2 100644
--- a/device/bluetooth/test/mock_bluetooth_cbcharacteristic_mac.mm
+++ b/device/bluetooth/test/mock_bluetooth_cbcharacteristic_mac.mm
@@ -94,6 +94,7 @@ CBCharacteristicProperties GattCharacteristicPropertyToCBCharacteristicProperty(
   scoped_nsobject<CBUUID> _UUID;
   CBCharacteristicProperties _cb_properties;
   base::scoped_nsobject<NSData> _value;
+  BOOL _notifying;
 }
 @end
 
@@ -144,6 +145,29 @@ CBCharacteristicProperties GattCharacteristicPropertyToCBCharacteristicProperty(
                                error:error];
 }
 
+- (void)simulateGattNotifySessionStarted {
+  _notifying = YES;
+  CBPeripheral* peripheral = _service.peripheral;
+  [peripheral.delegate peripheral:peripheral
+      didUpdateNotificationStateForCharacteristic:self.characteristic
+                                            error:nil];
+}
+
+- (void)simulateGattNotifySessionFailedWithError:(NSError*)error {
+  CBPeripheral* peripheral = _service.peripheral;
+  [peripheral.delegate peripheral:peripheral
+      didUpdateNotificationStateForCharacteristic:self.characteristic
+                                            error:error];
+}
+
+- (void)simulateGattCharacteristicChangedWithValue:(NSData*)value {
+  _value.reset([value copy]);
+  CBPeripheral* peripheral = _service.peripheral;
+  [peripheral.delegate peripheral:peripheral
+      didUpdateValueForCharacteristic:self.characteristic
+                                error:nil];
+}
+
 - (CBUUID*)UUID {
   return _UUID.get();
 }
@@ -164,4 +188,8 @@ CBCharacteristicProperties GattCharacteristicPropertyToCBCharacteristicProperty(
   return _value.get();
 }
 
+- (BOOL)isNotifying {
+  return _notifying;
+}
+
 @end