bluetooth: mac: Reject requestDevice promise if Mac version is <= 10.9

device/bluetooth/bluetooth_adapter_factory.h

Index: device/bluetooth/bluetooth_adapter_factory.h
diff --git a/device/bluetooth/bluetooth_adapter_factory.h b/device/bluetooth/bluetooth_adapter_factory.h
index 2f6bfcd4e58d416027b6fecd6161e7b345b23d44..ab800db0b63e3366f7c99b0a00a25d2bec2c5072 100644
--- a/device/bluetooth/bluetooth_adapter_factory.h
+++ b/device/bluetooth/bluetooth_adapter_factory.h
@@ -24,6 +24,10 @@ class DEVICE_BLUETOOTH_EXPORT BluetoothAdapterFactory {
   // platform.
   static bool IsBluetoothAdapterAvailable();
 
+  // Returns true if Bluetooth Low Energy is available for the current
+  // platform.
+  static bool IsLowEnergyAvailable();
+
   // Returns the shared instance of the default adapter, creating and
   // initializing it if necessary. |callback| is called with the adapter
   // instance passed only once the adapter is fully initialized and ready to