[Android] Add the test case about DomStorageEnabled and AppCacheEnabled.

Implement the test cases about DomStorageEnabled and AppCacheEnabled.

Test AppCache by setting the data in TestWebServer instance.
Test DomStorage by loading the html, in this html file, it checks
the domstorage enabled or not by javascript.

For test case "DomStorageEnabled" 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 testDomStorageEnabledWithTwoViews
Merge pull request #584 from wuhengzhi/domstorage

[Android] Add the test case about DomStorageEnabled and AppCacheEnabled.