Implement BluetoothRemoteGattCharacteristicWin::StartNotifySession and related unit tests

device/bluetooth/bluetooth_task_manager_win.cc

Index: device/bluetooth/bluetooth_task_manager_win.cc
diff --git a/device/bluetooth/bluetooth_task_manager_win.cc b/device/bluetooth/bluetooth_task_manager_win.cc
index bcb3823e094a32b7ac84faaa29288fb74af275d2..b89d69d71132da5151782a2c4c2fb650b78e9182 100644
--- a/device/bluetooth/bluetooth_task_manager_win.cc
+++ b/device/bluetooth/bluetooth_task_manager_win.cc
@@ -844,6 +844,26 @@ void BluetoothTaskManagerWin::WriteGattCharacteristicValue(
   ui_task_runner_->PostTask(FROM_HERE, base::Bind(callback, hr));
 }
 
+void BluetoothTaskManagerWin::RegisterGattCharacteristicValueChangedEvent(
+    base::FilePath service_path,
+    BTH_LE_GATT_CHARACTERISTIC characteristic,
+    const GattEventRegistrationCallback& callback,
+    PFNBLUETOOTH_GATT_EVENT_CALLBACK registered_callback,
+    void* context) {
+  BLUETOOTH_GATT_EVENT_HANDLE event_handle = NULL;
+
+  BLUETOOTH_GATT_VALUE_CHANGED_EVENT_REGISTRATION event_parameter;
+  memcpy(&(event_parameter.Characteristics[0]), &characteristic,
+         sizeof(BTH_LE_GATT_CHARACTERISTIC));
+  event_parameter.NumCharacteristics = 1;
+  HRESULT hr =
+      win::BluetoothLowEnergyWrapper::GetInstance()->RegisterGattEvents(
+          service_path, CharacteristicValueChangedEvent, &event_parameter,
+          registered_callback, context, &event_handle);
+
+  ui_task_runner_->PostTask(FROM_HERE, base::Bind(callback, event_handle, hr));
+}
+
 void BluetoothTaskManagerWin::PostGetGattIncludedCharacteristics(
     const base::FilePath& service_path,
     const BluetoothUUID& uuid,
@@ -876,8 +896,6 @@ void BluetoothTaskManagerWin::PostReadGattCharacteristicValue(
       FROM_HERE,
       base::Bind(&BluetoothTaskManagerWin::ReadGattCharacteristicValue, this,
                  service_path, *characteristic, callback));
-  FOR_EACH_OBSERVER(BluetoothTaskManagerWin::Observer, observers_,
-                    OnAttemptReadGattCharacteristic());
 }
 
 void BluetoothTaskManagerWin::PostWriteGattCharacteristicValue(
@@ -890,8 +908,28 @@ void BluetoothTaskManagerWin::PostWriteGattCharacteristicValue(
       FROM_HERE,
       base::Bind(&BluetoothTaskManagerWin::WriteGattCharacteristicValue, this,
                  service_path, *characteristic, new_value, callback));
-  FOR_EACH_OBSERVER(BluetoothTaskManagerWin::Observer, observers_,
-                    OnAttemptWriteGattCharacteristic());
+}
+
+void BluetoothTaskManagerWin::PostRegisterGattCharacteristicValueChangedEvent(
+    const base::FilePath& service_path,
+    const PBTH_LE_GATT_CHARACTERISTIC characteristic,
+    const GattEventRegistrationCallback& callback,
+    PFNBLUETOOTH_GATT_EVENT_CALLBACK registered_callback,
+    void* context) {
+  DCHECK(ui_task_runner_->RunsTasksOnCurrentThread());
+  bluetooth_task_runner_->PostTask(
+      FROM_HERE,
+      base::Bind(
+          &BluetoothTaskManagerWin::RegisterGattCharacteristicValueChangedEvent,
+          this, service_path, *characteristic, callback, registered_callback,
+          context));
+}
+
+void BluetoothTaskManagerWin::UnregisterGattCharacteristicValueChangedEvent(
+    BLUETOOTH_GATT_EVENT_HANDLE event_handle) {
+  DCHECK(ui_task_runner_->RunsTasksOnCurrentThread());
+  win::BluetoothLowEnergyWrapper::GetInstance()->UnregisterGattEvent(
+      event_handle);
 }
 
 }  // namespace device