hg: openjfx/9-dev/rt: 8131324: XYChart.extraValue change doesn't result in chart update.

[vadim.pakhnushev at oracle.com]

Changeset: a07011e8b224
Author:    vadim
Date:      2015-07-21 16:09 +0300
URL:       http://hg.openjdk.java.net/openjfx/9-dev/rt/rev/a07011e8b224

8131324: XYChart.extraValue change doesn't result in chart update.
Reviewed-by: jgiles

! modules/controls/src/main/java/javafx/scene/chart/XYChart.java
! modules/controls/src/test/java/javafx/scene/chart/XYChartDataTest.java