RFR: Merge jdk:master [v2]

[Kevin Rushforth]

> Manual merge of `jdk/master` into `lanai/master` since the nightly auto-merge process is still offline (see [SKARA-764](https://bugs.openjdk.java.net/browse/SKARA-764)).

Kevin Rushforth has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains 908 commits:

 - Merge jdk:master
 - 8255149: Lanai: DrawImage/IncorrectAlphaConversionBicubic.java failure
 - 8244718: J2DDemo - AlphaComposite tab - output colors are different with AA & non-AA
 - Merge jdk:master
 - 8254881: Commit commandbuffer after draw happens through JNI
 - 8254879: Implement JNI path for Draw Poly
 - 8254869: Refactor check_previous_op usage in Mask Fill
 - 8244845: Lanai : J2DDemo - Clipping - Two parallel lines do not appear with AA Rendering
 - 8242924: Selection is not correct in Paint.TextureAnim
   8253994: J2DDemo: Buttcap, SquareCap color is different in AlphaComposite mode
 - 8252726: Lanai: IDEA Editor Rendering  OGL vs Metal 1:2
 - ... and 898 more: https://git.openjdk.java.net/lanai/compare/5ec1b80c...5028b5c0

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Changes: https://git.openjdk.java.net/lanai/pull/122/files
 Webrev: https://webrevs.openjdk.java.net/?repo=lanai&pr=122&range=01
  Stats: 17946 lines in 92 files changed: 17852 ins; 21 del; 73 mod
  Patch: https://git.openjdk.java.net/lanai/pull/122.diff
  Fetch: git fetch https://git.openjdk.java.net/lanai pull/122/head:pull/122

PR: https://git.openjdk.java.net/lanai/pull/122