Soong: add "java_genrule_host"

am: 8f9ab6a26b

Change-Id: Id36b1b843b68e1dda9fd06d9b38eb80aa1da1918

java/genrule.go

@@ -21,6 +21,7 @@ import (
 
 func init() {
 	android.RegisterModuleType("java_genrule", genRuleFactory)
+	android.RegisterModuleType("java_genrule_host", genRuleFactoryHost)
 }
 
 // java_genrule is a genrule that can depend on other java_* objects.
@@ -33,3 +34,14 @@ func genRuleFactory() android.Module {
 
 	return module
 }
+
+// java_genrule_host is a genrule that can depend on other java_* objects.
+// The cmd may be run multiple times, once for each of the different host/device
+// variations.
+func genRuleFactoryHost() android.Module {
+	module := genrule.NewGenRule()
+
+	android.InitAndroidArchModule(module, android.HostSupported, android.MultilibCommon)
+
+	return module
+}