This paves the way for defining additional Android packages in
moz.build, which is a step toward moving the special
mobile/android/base/Makefile.in aapt invocations into the generic
java-build.mk framework.
The new variables are both passthru variables for now: in the future,
we'll roll them into some aggregate Android APK definition.
It's worth noting that references to the variables in Makefile.in
files are only defined after including rules.mk (and thereby
backend.mk). This only required a few changes in the tree but it
confused me for some time.
There are several parts to this ticket:
1) Produce javaaddons-1.0.jar, a standalone JAR defining a (versioned)
Java interface suitable for consumption by third-party Java addon
implementations.
2) Support the new V1 interface in the JavaAddonManager.
3) Add Robocop JavascriptTests testing the JavaScript message passing
interface to and from Java.
This patch can be read as "not in tests/" and "everything in tests/".
