Update Data Backup description to accommodate more devices.

Settings app on some Android devices may not necessarily
have backup and automatic restore options.  This CL adds an
instruction to work that around.

Change-Id: I72fb71e08dc7b2bd25f905c4d01fee0d248d4d97
diff --git a/apps/CtsVerifier/res/values/strings.xml b/apps/CtsVerifier/res/values/strings.xml
index cb35c3d..3225bcf 100644
--- a/apps/CtsVerifier/res/values/strings.xml
+++ b/apps/CtsVerifier/res/values/strings.xml
@@ -67,7 +67,10 @@
         \n\nFollow the instructions below to check that the data backup and restore works:
         \n\n1. Make sure backup and automatic restore are enabled in settings. Depending on the
         backup transport supported by the device you may need to do additional steps. For instance
-        you may need to set a Google account as the backup account for the device.
+        you may need to set a Google account as the backup account for the device. If you cannot
+        find the corresponding setting options on your device, run \"adb shell bmgr enable true\"
+        to enable the backup manager. You can check its status by executing \"adb shell bmgr
+        enabled\".
         \n\n2. Run the backup manager: adb shell bmgr run
         \n\n3. Uninstall the program: adb uninstall com.android.cts.verifier
         \n\n4. Reinstall the CTS Verifier and verify that the values are still the same.