Bluetooth: mac: add connected BLE devices at startup

device/bluetooth/test/bluetooth_test.h

Index: device/bluetooth/test/bluetooth_test.h
diff --git a/device/bluetooth/test/bluetooth_test.h b/device/bluetooth/test/bluetooth_test.h
index 9f5468ef7c1fb3b44700ee5aad8d9d434ef945c2..3570bd76aa22953b46696d61e03e924d0cdbb1e4 100644
--- a/device/bluetooth/test/bluetooth_test.h
+++ b/device/bluetooth/test/bluetooth_test.h
@@ -104,6 +104,11 @@ class BluetoothTestBase : public testing::Test {
   // controlled by this test fixture.
   virtual void InitWithFakeAdapter() {}
 
+  // Initializes the BluetoothAdapter |adapter_| with a fake adapter that can be
+  // controlled by this test fixture. The adapter already contains a connected
+  // peripheral.
+  virtual void InitWithFakeAdapterWithConnectedLowEnergyDevice() {}
+
   // Configures the fake adapter to lack the necessary permissions to scan for
   // devices.  Returns false if the current platform always has permission.
   virtual bool DenyPermission();