[OpenJDK 2D-Dev] RFR: 7018932 : Drawing very large coordinates with a dashed Stroke can cause Java to hang

[Laurent Bourgès]

This is my first fix proposal on this bug:
- added new method strokeTo(... Region clip ...) in the abstract RenderingEngine class
- fix all RenderingEngine implementations in java.desktop module
- MarlinRenderingEngine now use the clip region to roughly & quickly clip the given shape in strokeTo(clip) 
- LoopPipe.getStrokeSpans() uses the new strokeTo(clip) method to get good performance with huge dashed shapes.

I will write a new test class in follow-up commits to validate the bug fix.

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Commit messages:
 - fixed whitespaces
 - jdk-7018932.0

Changes: https://git.openjdk.java.net/jdk/pull/2013/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=2013&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-7018932
  Stats: 225 lines in 5 files changed: 219 ins; 1 del; 5 mod
  Patch: https://git.openjdk.java.net/jdk/pull/2013.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/2013/head:pull/2013

PR: https://git.openjdk.java.net/jdk/pull/2013