bluetooth: Expose service data from BlueZ

device/bluetooth/bluez/bluetooth_device_bluez.cc

Index: device/bluetooth/bluez/bluetooth_device_bluez.cc
diff --git a/device/bluetooth/bluez/bluetooth_device_bluez.cc b/device/bluetooth/bluez/bluetooth_device_bluez.cc
index 417ed161d40b86266ffbb43cea208a835ae1a5ec..50f15ebd401bc3ff07019dadb5edb22be2c1983c 100644
--- a/device/bluetooth/bluez/bluetooth_device_bluez.cc
+++ b/device/bluetooth/bluez/bluetooth_device_bluez.cc
@@ -595,6 +595,20 @@ void BluetoothDeviceBlueZ::GetServiceRecords(
                  weak_ptr_factory_.GetWeakPtr(), error_callback));
 }
 
+void BluetoothDeviceBlueZ::UpdateServiceData() {
+  bluez::BluetoothDeviceClient::Properties* properties =
+      bluez::BluezDBusManager::Get()->GetBluetoothDeviceClient()->GetProperties(
+          object_path_);
+  DCHECK(properties);
+  DCHECK(properties->service_data.is_valid());

[ortuno, 2016/10/05 06:27:10]

Does bluez cache service data i.e. if a device stops advertising service data
will bluez send a property changed event?

If so please add a comment here; otherwise, update service_data_ accordingly and
add a test for it.

What about changing service data i.e. if a device is constantly changing its
service data would bluez cache them all or would it change for each?

Please document the BlueZ behavior in the GetServiceData docs, similar to
GetUUIDs.

[puthik_chromium, 2016/10/06 01:49:56]

Add comment in header file instead.
- BlueZ won't send property change event when device stops advertising service
data
- BlueZ will send property change event for each service data changed.

+
+  service_data_.clear();
+  for (const auto& pair : properties->service_data.value()) {
+    service_data_.insert(std::pair<BluetoothUUID, std::vector<uint8_t>>(
+        BluetoothUUID(pair.first), pair.second));
+  }
+}
+
 BluetoothPairingBlueZ* BluetoothDeviceBlueZ::BeginPairing(
     BluetoothDevice::PairingDelegate* pairing_delegate) {
   pairing_.reset(new BluetoothPairingBlueZ(this, pairing_delegate));