[Android] Prompt error message when there is filed error in manifest.json.

[Android] Prompt error message when there is filed error in maniest.j…
…son.

  When there is field error in the file of manifest.json, error message
should be prompted. This fix is to prompt the error message if there is
filed error in manifest.json. In addition, the corresponding test cases
are added.

BUG=https://crosswalk-project.org/jira/browse/XWALK-648