[Android] Add the test case about setDatabaseEnabled.

Test database by set the function setDatabaseEnabled true or false.

This test case should add the parameter "--test_data", as follows:
build/android/run_instrumentation_tests.py --test-apk XWalkCoreTest \
--test_data xwalkview:xwalk/test/data/device_files/ \
--verbose -I --num_retries=1 -f testDatabaseEnabled