[SMACK] Label xwalk binaries with User domain

*In order to make all xwalk binaries running with same User domain
 label, we enforce "exec_label" property for them.
[Application] Remove Tizen user checking on Linux

We don't need to check user on Linux. The gyp configs are also changed.
Merge pull request #1853 from xuzhang/smack

[SMACK] change xwalk binary smack exec label
[Runtime] Add missing default cookieable schemes

Add default cookieable schemes for URL request context.

BUG=XWALK-1698
Merge pull request #1985 from seanlong/launcher_fix

[Application] Remove Tizen user checking on Linux
Merge pull request #1984 from seanlong/xwalk-1698

[Runtime] Add missing default cookieable schemes
Bump version to 7.35.143.0
[Android] Allow XWalkView to use TextureView as backend for animation

* Add a preference key ANIMATABLE_XWALK_VIEW to enable animation on XWalkView
* Update XWalkView API documentation

BUG=https://crosswalk-project.org/jira/browse/XWALK-1574
[Android] Add sample code for animatable XWalkView usage

Alpha and scale X/Y is animated on the XWalkView in the sample code.
Merge pull request #1986 from hmin/textureview

Re-commit TexureView enabling patch on xwalk side
[Android] Add test case for navigate().

This patch is to add test case for navigate().
Open two url, navigate to back url, get the url and compare it with the expected result.
navigate to forward url, get the url and compare it with the expected result.