device/blueooth: Add BlueZ unit test for BluetoothDevice::SetConnectionInterval.

device/bluetooth/dbus/fake_bluetooth_device_client.cc

Index: device/bluetooth/dbus/fake_bluetooth_device_client.cc
diff --git a/device/bluetooth/dbus/fake_bluetooth_device_client.cc b/device/bluetooth/dbus/fake_bluetooth_device_client.cc
index cc4eaefd168133e2254bf8b58a50028a5a22380d..4f0243de137cf02b6c0f0cf409886aea2197b029 100644
--- a/device/bluetooth/dbus/fake_bluetooth_device_client.cc
+++ b/device/bluetooth/dbus/fake_bluetooth_device_client.cc
@@ -601,8 +601,9 @@ void FakeBluetoothDeviceClient::SetLEConnectionParameters(
     const base::Closure& callback,
     const ErrorCallback& error_callback) {
   Properties* properties = GetProperties(object_path);
-  if (!properties->connected.value()) {
-    error_callback.Run(bluetooth_device::kErrorNotConnected, "Not Connected");
+  if (!properties->type.is_valid() || properties->type.value() == kTypeBredr) {
+    error_callback.Run(bluetooth_device::kErrorFailed,
+                       "BR/EDR devices not supported");
     return;
   }