FYI: JDK-8241143 Lanai: LinearGradient does not work in AA mode

[Alexey Ushakov]

Implemented gradient paint in AA mode

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Commit messages:
 - JDK-8241143 Lanai: LinearGradient does not work in AA mode

Changes: https://git.openjdk.java.net/lanai/pull/10/files
 Webrev: https://webrevs.openjdk.java.net/lanai/10/webrev.00
  Stats: 43 lines in 2 files changed: 43 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/lanai/pull/10.diff
  Fetch: git fetch https://git.openjdk.java.net/lanai pull/10/head:pull/10

PR: https://git.openjdk.java.net/lanai/pull/10