Integrated: 8254881: Commit commandbuffer after draw happens through JNI

[Jayathirth D V]

Need to commit commanbuffer whenever we are drawing directly through JNI. Otherwise we will lose the content drawn on
update.

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Commit messages:
 - 8254881: Commit commandbuffer after draw happens through JNI

Changes: https://git.openjdk.java.net/lanai/pull/118/files
 Webrev: https://webrevs.openjdk.java.net/?repo=lanai&pr=118&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8254881
  Stats: 30 lines in 3 files changed: 30 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/lanai/pull/118.diff
  Fetch: git fetch https://git.openjdk.java.net/lanai pull/118/head:pull/118

PR: https://git.openjdk.java.net/lanai/pull/118