[Android] Support loading manifest following w3c spec

Spec: http://w3c.github.io/manifest/

This commit is only for the loading API of XWalkView to
work with w3c manifest spec.
For packaging tool's support, it needs additional work.

BUG=https://crosswalk-project.org/jira/browse/XWALK-1920
Merge pull request #2095 from wang16/w3c_manifest

[Android] Support loading manifest following w3c spec