bluetooth: Introduce SetLowEnergyAvailableForTesting

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 ab800db0b63e3366f7c99b0a00a25d2bec2c5072..43cf6865fc1ea840793ab8e34384ec4e44fc02d2 100644
--- a/device/bluetooth/bluetooth_adapter_factory.h
+++ b/device/bluetooth/bluetooth_adapter_factory.h
@@ -6,6 +6,7 @@
 #define DEVICE_BLUETOOTH_BLUETOOTH_ADAPTER_FACTORY_H_
 
 #include "base/callback.h"
+#include "base/lazy_instance.h"
 #include "base/memory/ref_counted.h"
 #include "build/build_config.h"
 #include "device/bluetooth/bluetooth_adapter.h"
@@ -20,13 +21,17 @@ class DEVICE_BLUETOOTH_EXPORT BluetoothAdapterFactory {
   typedef base::Callback<void(scoped_refptr<BluetoothAdapter> adapter)>
       AdapterCallback;
 
+  ~BluetoothAdapterFactory();
+
+  static BluetoothAdapterFactory& Get();
+
   // Returns true if the Bluetooth adapter is available for the current
   // platform.
   static bool IsBluetoothAdapterAvailable();
 
   // Returns true if Bluetooth Low Energy is available for the current
   // platform.
-  static bool IsLowEnergyAvailable();
+  bool IsLowEnergyAvailable();
 
   // Returns the shared instance of the default adapter, creating and
   // initializing it if necessary. |callback| is called with the adapter
@@ -48,6 +53,17 @@ class DEVICE_BLUETOOTH_EXPORT BluetoothAdapterFactory {
   // Returns true iff the implementation has a (non-NULL) shared instance of the
   // adapter. Exposed for testing.
   static bool HasSharedInstanceForTesting();
+
+  // Sets the return value for IsLowEnergyAvailable() to |available|.
+  void SetLowEnergyAvailableForTesting(bool available);
+
+ private:
+  // Friend LazyInstance to permit access to private constructor.
+  friend base::LazyInstanceTraitsBase<BluetoothAdapterFactory>;
+
+  BluetoothAdapterFactory();
+
+  base::Optional<bool> le_available_for_testing_;
 };
 
 }  // namespace device