[Android] Refine the transmission of parameter in customize.py.

This patch is to refine the transmission of parameter for android tools.
The transmission of command line was depredated, so refine it to call
functions.
[Android] Change the class modifier for the core library.

Set the classes defined in the core library with correct modifiers.
Previously lots of them are public which are not appropriate. Only
expose classes which will be for API. Some of them are still public
due to the usage of Cordova and Test Shell. Will do them.

BUG=https://crosswalk-project.org/jira/browse/XWALK-1041
Merge pull request #1707 from yongsheng/embeddingapi

[Android] Change the class modifier for the core library.
Merge pull request #1672 from wuhengzhi/refine_customize

[Android] Refine the transmission of parameter in customize.py.
[Runtime] Enable WARP for WGT package

The Widget Access Request Policy (WARP) specification is a security
mechanism to control network access from within a widget application, as
well as a method for authors to request that the user agent grant access
to certain network resources or sets thereof.

The reference link is http://www.w3.org/TR/widgets-access/.