Add search index provider for bt page

1. Implement the search index provider for
ConnectedDeviceDashboardFragment.
2. Since in SEARCH_INDEX_DATA_PROVIDER fragment is null,
so we need to pass in context to all components
instead of getting it from fragment.
3. Update test for it as well as creating new shadow.

Change-Id: If0aa67d5b6ca207c6b728c8355581bf414577091
Fixes: 69333961
Test: RunSettingsRoboTests

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

@@ -93,9 +93,9 @@ public abstract class BluetoothDeviceUpdater implements BluetoothCallback {
         }
     }
 
-    public BluetoothDeviceUpdater(DashboardFragment fragment,
+    public BluetoothDeviceUpdater(Context context, DashboardFragment fragment,
             DevicePreferenceCallback devicePreferenceCallback) {
-        this(fragment, devicePreferenceCallback, Utils.getLocalBtManager(fragment.getContext()));
+        this(fragment, devicePreferenceCallback, Utils.getLocalBtManager(context));
     }
 
     @VisibleForTesting