[9] Review request for FX Jigsaw changes

[Kevin Rushforth]

Please review the webrev for reviewing the jigsaw changes for FX.

https://bugs.openjdk.java.net/browse/JDK-8092093

http://cr.openjdk.java.net/~kcr/8092093/webrev.00/rt/
http://cr.openjdk.java.net/~kcr/8092093/webrev.00/rt-fxpackager/

I have separated out the in-progress changes to modules/fxpackager* 
(jdk.packager and jdk.packager.services modules) so they can be reviewed 
separately. However, they will be pushed along with the other changes as 
a single changeset.

These changes are planned to be integrated into FX 9 at the same time as 
the JDK changes are integrated (probably next week). They will be synced 
down to FX 9-dev shortly after that.

Please note the following:

* The required boot JDK to build FX after the Jigsaw integration will be 
JDK 9 build 109. We are not yet able to build with a Jigsaw-based JDK 9 
as the boot JDK yet, so we will be sticking at JDK 9 build 109 for a few 
weeks.

* gradle 2.11 is required to build using JDK 9

* In addition to building JavaFX as modules for use with a 
Jigsaw-capable JDK, we still build the "legacy sdk" using the existing 
pre-Jigsaw layout, including jfxrt.jar, etc. As such, most developers 
during the transition will hopefully not notice too much change.

* If you do want to run tests using the modules, you will need a 
Jigsaw-based JDK with javafx modules included, and point to that with a 
JDK9_HOME (likely to be changed to JIGSAW_HOME) env variable. If you 
actually want to build the JDK (which you will need to do if any module 
dependencies change), we will send out separate instructions. These will 
eventually make it onto the OpenJFX Wiki.

* The fxpackager modules are disabled by default. To enable them, you 
need to build a Jigsaw-based JDK *without* the jdk.pacakger* modules and 
point to that with a JDK9_HOME (likely to be changed to JIGSAW_HOME) env 
variable. Since most developers will not build in this mode, you need to 
set 'gradle -PBUILD_FXPACKAGER' to enable building the packager.

* I will refresh the webrev tomorrow afternoon, after making a couple of 
planned changes and reacting to any feedback, and again on Wednesday 
afternoon.

-- Kevin