8u40 review: RT-37999 - need API for line dashing in Canvas/GraphicsContext

[Jim Graham]

webrev: http://cr.openjdk.java.net/~flar/RT-37999/webrev.00/
Jira: https://javafx-jira.kenai.com/browse/RT-37999
Includes API unit tests and a graphical test is attached to the Jira 
issue...

                        ...jim