java_library support for building headers-only

Flag for java_library modules to build just the Turbine headers and
skip building an impl jar.

Test: m framework-minus-apex-headers
Bug: 289776578
Ignore-AOSP-First: Change stacked with changes in internal repos

Change-Id: If8b4033462d39c689cba0ed38cc343e4786ea280

android/neverallow.go

@@ -60,6 +60,7 @@ func init() {
 	AddNeverAllowRules(createBp2BuildRule())
 	AddNeverAllowRules(createCcStubsRule())
 	AddNeverAllowRules(createJavaExcludeStaticLibsRule())
+	AddNeverAllowRules(createProhibitHeaderOnlyRule())
 }
 
 // Add a NeverAllow rule to the set of rules to apply.
@@ -264,6 +265,13 @@ func createJavaExcludeStaticLibsRule() Rule {
 		Because("exclude_static_libs property is only allowed for java modules defined in build/soong, libcore, and frameworks/base/api")
 }
 
+func createProhibitHeaderOnlyRule() Rule {
+	return NeverAllow().
+		Without("name", "framework-minus-apex-headers").
+		With("headers_only", "true").
+		Because("headers_only can only be used for generating framework-minus-apex headers for non-updatable modules")
+}
+
 func neverallowMutator(ctx BottomUpMutatorContext) {
 	m, ok := ctx.Module().(Module)
 	if !ok {