Export app implementation and header jars to Make

App implementation and header jars are necessary for tests to
run against apps.

Test: m checkbuild
Change-Id: Ia54ebf41f17346d3c59f3ec9512e68f195cdb67f
diff --git a/java/androidmk.go b/java/androidmk.go
index 40ebe5b..24fe43a 100644
--- a/java/androidmk.go
+++ b/java/androidmk.go
@@ -156,6 +156,12 @@
 				if app.dexJarFile != nil {
 					fmt.Fprintln(w, "LOCAL_SOONG_DEX_JAR :=", app.dexJarFile.String())
 				}
+				if app.implementationJarFile != nil {
+					fmt.Fprintln(w, "LOCAL_SOONG_CLASSES_JAR :=", app.implementationJarFile)
+				}
+				if app.headerJarFile != nil {
+					fmt.Fprintln(w, "LOCAL_SOONG_HEADER_JAR :=", app.headerJarFile.String())
+				}
 				if app.jacocoReportClassesFile != nil {
 					fmt.Fprintln(w, "LOCAL_SOONG_JACOCO_REPORT_CLASSES_JAR :=", app.jacocoReportClassesFile.String())
 				}