RFR: 8255015: Inconsistent illumination of 3D shape by PointLight

[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)

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Commit messages:
 - 8255015: Copy pixel scale factors from graphics object to subscene graphics so that the position of lights will be scaled correctly on retina displays

Changes: https://git.openjdk.java.net/jfx/pull/530/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jfx&pr=530&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8255015
  Stats: 4 lines in 1 file changed: 4 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/jfx/pull/530.diff
  Fetch: git fetch https://git.openjdk.java.net/jfx pull/530/head:pull/530

PR: https://git.openjdk.java.net/jfx/pull/530