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

core/java.mk

@@ -495,7 +495,11 @@ common_proguard_flags :=  \
 ifeq ($(filter nosystem,$(LOCAL_PROGUARD_ENABLED)),)
 common_proguard_flags += -include $(BUILD_SYSTEM)/proguard.flags
 ifeq ($(LOCAL_EMMA_INSTRUMENT),true)
+ifdef LOCAL_JACK_ENABLED
+common_proguard_flags += -include $(BUILD_SYSTEM)/proguard.jacoco.flags
+else
 common_proguard_flags += -include $(BUILD_SYSTEM)/proguard.emma.flags
+endif # LOCAL_JACK_ENABLED
 endif
 # If this is a test package, add proguard keep flags for tests.
 ifneq ($(LOCAL_INSTRUMENTATION_FOR)$(filter tests,$(LOCAL_MODULE_TAGS)),)
@@ -666,6 +670,15 @@ $(built_dex).toc: $(full_classes_jack)
 else #LOCAL_IS_STATIC_JAVA_LIBRARY
 $(built_dex_intermediate): PRIVATE_CLASSES_JACK := $(full_classes_jack)
 
+ifeq ($(LOCAL_EMMA_INSTRUMENT),true)
+$(built_dex_intermediate): PRIVATE_JACK_COVERAGE_OPTIONS := \
+    -D jack.coverage="true" \
+    -D jack.coverage.metadata.file=$(intermediates.COMMON)/coverage.em \
+    -D jack.coverage.jacoco.package=$(JACOCO_PACKAGE_NAME)
+else
+$(built_dex_intermediate): PRIVATE_JACK_COVERAGE_OPTIONS :=
+endif
+
 $(built_dex_intermediate): $(jack_all_deps) | setup-jack-server
 	@echo Building with Jack: $@
 	$(jack-java-to-dex)