[OpenJDK 2D-Dev] RFR: 8u backport of 8078464 : Path2D storage growth algorithms should be less linear

[Phil Race]

I have prepared a direct 8u-dev backport of the  JDK 9
fix for https://bugs.openjdk.java.net/browse/JDK-8078464
http://cr.openjdk.java.net/~prr/8078464.8u/

Please review.

For reference the JDK 9 review was here : 
http://mail.openjdk.java.net/pipermail/2d-dev/2015-April/005259.html
and the JDK 9 changeset is here 
http://hg.openjdk.java.net/jdk9/client/jdk/rev/9b6ed21ae317

-phil.