Refreshing Bluetooth devices will clear all available devices.

Bug: 16851309
Change-Id: I9ffb1ddaeb8e785be145ea79467fc361a022d8d7

src/com/android/settings/bluetooth/CachedBluetoothDeviceManager.java

@@ -86,7 +86,9 @@ final class CachedBluetoothDeviceManager {
             BluetoothDevice device) {
         CachedBluetoothDevice newDevice = new CachedBluetoothDevice(mContext, adapter,
             profileManager, device);
-        mCachedDevices.add(newDevice);
+        synchronized (mCachedDevices) {
+            mCachedDevices.add(newDevice);
+        }
         return newDevice;
     }
 
@@ -110,6 +112,10 @@ final class CachedBluetoothDeviceManager {
         return device.getAddress();
     }
 
+    public synchronized void clearCachedDevices() {
+        mCachedDevices.clear();
+    }
+
     public synchronized void onScanningStateChanged(boolean started) {
         if (!started) return;