[Android][Runtime] Add SysApp APIs in XWalkRuntimeClientEmbeddedShell

Fixed two problems:
1. Android version of device capabilities js should be included, not the
C++ version.
2. Missing contacts api and messaging api js files.

BUG=XWALK-1903
Merge pull request #2106 from deqing/runtime-embedded

[Android][Runtime] Add SysApp APIs in XWalkRuntimeClientEmbeddedShell