RFR: 8246331: Lanai: do not update AA clip info in nonAA mode

[Alexey Ushakov]

Update clip info on demand

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Commit messages:
 - 8246331: Lanai: do not update AA clip info in nonAA mode

Changes: https://git.openjdk.java.net/lanai/pull/50/files
 Webrev: https://webrevs.openjdk.java.net/lanai/50/webrev.00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8246331
  Stats: 174 lines in 4 files changed: 89 ins; 69 del; 16 mod
  Patch: https://git.openjdk.java.net/lanai/pull/50.diff
  Fetch: git fetch https://git.openjdk.java.net/lanai pull/50/head:pull/50

PR: https://git.openjdk.java.net/lanai/pull/50