bluetooth: mac: write characteristic implementation

device/bluetooth/bluetooth_remote_gatt_characteristic_mac.h

Index: device/bluetooth/bluetooth_remote_gatt_characteristic_mac.h
diff --git a/device/bluetooth/bluetooth_remote_gatt_characteristic_mac.h b/device/bluetooth/bluetooth_remote_gatt_characteristic_mac.h
index d591f174aa4b6b10477995e66a71020a6283bd92..3a5334421bf999a075a907a50e05da42b50b7977 100644
--- a/device/bluetooth/bluetooth_remote_gatt_characteristic_mac.h
+++ b/device/bluetooth/bluetooth_remote_gatt_characteristic_mac.h
@@ -10,6 +10,7 @@
 #include "base/mac/scoped_nsobject.h"
 
 @class CBCharacteristic;
+typedef NS_ENUM(NSInteger, CBCharacteristicWriteType);
 
 namespace device {
 
@@ -55,8 +56,15 @@ class DEVICE_BLUETOOTH_EXPORT BluetoothRemoteGattCharacteristicMac
   // Called by the BluetoothRemoteGattServiceMac instance when the
   // characteristics value has been read.
   void DidUpdateValue(NSError* error);
+  // Called by the BluetoothRemoteGattServiceMac instance when the
+  // characteristics value has been written.
+  void DidWriteValue(NSError* error);
   // Returns true if the characteristic is readable.
   bool IsReadable() const;
+  // Returns true if the characteristic is writable.
+  bool IsWritable() const;
+  // Returns the write type (with or without responses).
+  CBCharacteristicWriteType GetCBWriteType() const;
   // Returns CoreBluetooth characteristic.
   CBCharacteristic* GetCBCharacteristic() const;
 
@@ -74,6 +82,8 @@ class DEVICE_BLUETOOTH_EXPORT BluetoothRemoteGattCharacteristicMac
   bool characteristic_value_read_or_write_in_progress_;
   // ReadRemoteCharacteristic request callbacks.
   std::pair<ValueCallback, ErrorCallback> read_characteristic_value_callbacks_;
+  // WriteRemoteCharacteristic request callbacks.
+  std::pair<base::Closure, ErrorCallback> write_characteristic_value_callbacks_;
 };
 
 }  // namespace device