Integrated: 8252057: Crash in metal pipeline when dragging any Swing app to other…

[Alexey Ushakov]

… screen

Perform endEncoding on any switch of MTLContext

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Commit messages:
 - 8252057: Crash in metal pipeline when dragging any Swing app to other screen

Changes: https://git.openjdk.java.net/lanai/pull/78/files
 Webrev: https://webrevs.openjdk.java.net/lanai/78/webrev.00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8252057
  Stats: 12 lines in 1 file changed: 12 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/lanai/pull/78.diff
  Fetch: git fetch https://git.openjdk.java.net/lanai pull/78/head:pull/78

PR: https://git.openjdk.java.net/lanai/pull/78