JDK-8062810: Reorganize source classes in src.zip by modules

[Mandy Chung]

The JDK source code has been reorganized by modules, as described in
JEP 201 [1].  src.zip shipped in JDK image has not been changed (see
JDK-8062810 [2]).

src.zip contains the source classes for modular JDK and it’s sensible
to organize source classes in src.zip by modules.  javafx-src.zip
has similiar issue and its layout has not be changed.  In addition,
there isn’t any good reason why javafx-src.zip has to stay as a
separate file as we know of.

Our proposal is to change the layout of src.zip in JDK 9 to
    $MODULE/$PACKAGE/*.java

i.e. the source files are grouped by modules.

*and*

Ship one src.zip file to contain the sources for both JDK and JavaFX [3]

i.e. JDK 9 image will no longer have javafx-src.zip.

This change would impact IDEs and other tools that look at src.zip
or javafx-src.zip.  We believe that this likely not require significant
change to these tools.  Please share if you have any concern or feedback.

Mandy
[1] http://openjdk.java.net/jeps/201
[2] https://bugs.openjdk.java.net/browse/JDK-8062810

[3] JavaFX modules are linked in to JDK image when they are imported 
during JDK build with —-with-import-modules configure option.  When
JavaFX modules are not imported, src.zip will only contain the sources
for JDK modules.