RFR: 8260931: Implement JEP 382: New macOS Rendering Pipeline [v8]

[Ajit Ghaisas]

> **Description :**
> This is the implementation of [JEP 382 : New macOS Rendering Pipeline](https://bugs.openjdk.java.net/browse/JDK-8238361)
> It implements a Java 2D internal rendering pipeline for macOS using the Apple Metal API.
> The entire work on this was done under [OpenJDK Project - Lanai](http://openjdk.java.net/projects/lanai/)
> 
> We iterated through several Early Access (EA) builds and have reached a stage where it is ready to be integrated to openjdk/jdk. The latest EA build is available at - https://jdk.java.net/lanai/
> 
> A new option -Dsun.java2d.metal=true | True needs to be used to use this pipeline.
> 
> **Testing :**
> This implementation has been tested with the tests present at - [Test Plan for JEP 382: New macOS Rendering Pipeline](https://bugs.openjdk.java.net/browse/JDK-8251396)
> 
> **Note to reviewers :**
> 1) Default rendering pipeline on macOS has not been changed by this PR. OpenGL still stays as the default rendering pipeline and Metal rendering pipeline is optional to choose.
> 
> 2) To apply and test this PR - 
> To enable the metal pipeline you must specify on command line -Dsun.java2d.metal=true (No message will be printed in this case) or -Dsun.java2d.metal=True (A message indicating Metal rendering pipeline is enabled gets printed)
> 
> 3) Review comments (including some preliminary informal review comments) are tracked with JBS issues - https://bugs.openjdk.java.net/issues/?filter=40598

Ajit Ghaisas has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains 20 additional commits since the last revision:

 - Lanai PR#191 - 8261705 - jdv
 - Lanai PR#190 - 8261706 - jdv
 - Lanai PR#189 - 8261712 - avu
 - Lanai PR#187 - 8261704 - jdv
 - Lanai PR#186 - 8261638 - avu
 - Lanai PR#185 - 8261632 - jdv
 - Lanai PR#184 - 8261620 - aghaisas
 - Lanai PR#182 - 8261547 - psadhukhan
 - Merge branch 'master' into 8260931_lanai_JEP_branch
 - Lanai PR#181 - 8261143 - aghaisas
 - ... and 10 more: https://git.openjdk.java.net/jdk/compare/89c20e04...7b0b0dc4

-------------

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/2403/files
  - new: https://git.openjdk.java.net/jdk/pull/2403/files/7340d067..7b0b0dc4

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=2403&range=07
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=2403&range=06-07

  Stats: 6664 lines in 263 files changed: 3414 ins; 1659 del; 1591 mod
  Patch: https://git.openjdk.java.net/jdk/pull/2403.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/2403/head:pull/2403

PR: https://git.openjdk.java.net/jdk/pull/2403