[Tizen][GPU][Perf] Prevent GPU scheduler from thrashiing.

This PR turns off pre-empty scheduling. On highend machines, pre-empty scheduling reduces
the latency of GPU commands. However, on Tizen mobile, this can cause the kernel
to thrash between generating GPU commands and executing them. Android already
turned off pre-empty scheduling also.

In addition, this PR is related to the private HW issue. Refer to
https://crosswalk-project.org/jira/browse/XWALK-348?focusedCommentId=13435&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-13435

BUG=https://crosswalk-project.org/jira/browse/XWALK-348