RFR: 8255015: Inconsistent illumination of 3D shape by PointLight [v11]

[Andreas Heger]

> The inconsistent illumination happens on Macs with retina displays only if the 3D shape is placed in a SubScene. The light sources are located with wrong coordinates in sub scenes and this causes a different illumination. The wrong coordinates for the light sources come from the fact that the retina pixel scale factors are not used in a SubScene.
> 
> With this pull request, the retina pixel scale factors will be also used in SubScenes and this should resolve the bug [https://bugs.openjdk.java.net/browse/JDK-8255015](url)

Andreas Heger 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 10 additional commits since the last revision:

 - Merge branch 'openjdk:master' into fix-8255015
 - 8255015: Comments corrected
 - 8255015: Comment about copying pixel scale factors corrected
 - 8255015: Tabs removed from PointLightIllumination.java
 - Merge branch 'openjdk:master' into fix-8255015
 - 8255015: JUnit Test class added.
 - Merge branch 'openjdk:master' into fix-8255015
 - Merge branch 'openjdk:master' into fix-8255015
 - Merge branch 'openjdk:master' into fix-8255015
 - 8255015: Copy pixel scale factors from graphics object to subscene graphics so that the position of lights will be scaled correctly on retina displays

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Changes:
  - all: https://git.openjdk.java.net/jfx/pull/531/files
  - new: https://git.openjdk.java.net/jfx/pull/531/files/cc995300..656cb7d8

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jfx&pr=531&range=10
 - incr: https://webrevs.openjdk.java.net/?repo=jfx&pr=531&range=09-10

  Stats: 2 lines in 2 files changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.java.net/jfx/pull/531.diff
  Fetch: git fetch https://git.openjdk.java.net/jfx pull/531/head:pull/531

PR: https://git.openjdk.java.net/jfx/pull/531