Update DEPS.xwalk to include new patch in Chromium

https://github.com/crosswalk-project/crosswalk/pull/1539
This PR depends on the patch in Chromium, with PR
https://github.com/crosswalk-project/chromium-crosswalk/pull/115

BUG=https://crosswalk-project.org/jira/browse/XWALK-880
Merge pull request #1590 from xingnan/deps

Update DEPS.xwalk to include new patch in Chromium
[Android] Fix the unit test fail issue caused by launch screen patch

1. Need to initialize options.launch_screen_img before using it.
2. Check fullscreen flag from theme.xml file.
Merge pull request #1595 from kurli/test-fail-fix

[Android] Fix the unit test fail issue caused by launch screen patch
[Android] Exit with error code when the make apk test cases failed.

Because the trybot requests exit code for main page to check
whether PR passes the make apk test cases. Currently,
the make_apk_test.py only display the error info, but always exit
with 0 even if it failed. So the main page of trybot will always show
tests passed.

Add a function to check the make_apk_test.py's result, and exit
with correct code according to this result.