Support code coverage with Jack

Building an app with Jack and with the environment variable
EMMA_INSTRUMENT_STATIC set to true will apply code coverage
onto the app targeting Jacoco.

Bug: 20115492
Change-Id: Ief3640fa3faa466f7f6aaa9739e06d3db24110a0
diff --git a/core/main.mk b/core/main.mk
index 14594e7..79c737c 100644
--- a/core/main.mk
+++ b/core/main.mk
@@ -329,6 +329,11 @@
 # Install and start Jack server
 -include $(TOPDIR)prebuilts/sdk/tools/jack_server_setup.mk
 
+#
+# -----------------------------------------------------------------
+# Jacoco package name for Jack
+-include $(TOPDIR)external/jacoco/config.mk
+
 # -----------------------------------------------------------------
 ###
 ### In this section we set up the things that are different