[wrt][xwalk-2917]Update tests.xml

Check the tests.xml is ok
[webapi] Fix screen orientation test cases according to spec.

1, We need to use a valid functionn to wrap the "fake" function callback (e.g. unreached_func() in this case).
2, According to screen orientation w3c spec http://www.w3.org/TR/screen-orientation/#orientationlocktype-enum, the "OrientationLockType" cannot be angle value such as "0", "90", "180", "270"
3, The screen.orientation.lock() cannot be invoked in parallel. That might cause the JavaScript Promise object's resolved callback not be invoked. Instead, we should call them in sequence.

BUG=XWALK-2513
[wrt] Update xwalk-launcher to open_app
[wrt] Update xwalk-launcher to open_app
Merge pull request #1209 from yunxliu/yunxliu/usecase/modifyScript

[wrt] Update xwalk-launcher to open_app
Merge pull request #1208 from yunxliu/yunxliu/misc/modifyScript

[wrt] Update xwalk-launcher to open_app
Merge pull request #1200 from linshen/shenlin/update-xwalk-2917

[wrt][xwalk-2917]Update tests.xml
Merge pull request #1205 from yejingfu/bug-fix

[webapi] Fix screen orientation test cases according to spec.