[Android] Support multiple icons for packaging tool.

This patch is to implement the feature about multiple icons for
packaging tool.
The icon size in manifest.json was defined by web developer, we
won't be able to predict the size, so we use interval to estimate
the icon size.

BUG=https://crosswalk-project.org/jira/browse/XWALK-690
Merge pull request #1601 from wuhengzhi/multi_icon

[Android] Support multiple icons for packaging tool.