Keep the emma classes if emma is enabled.

Change-Id: Ie551d48532c61bf610b12875dc33cfe476625c5e

core/java.mk

@@ -322,6 +322,9 @@ proguard_flags := $(addprefix -libraryjars ,$(proguard_full_java_libs)) \
                   -include $(BUILD_SYSTEM)/proguard.flags \
                   -forceprocessing \
                   -printmapping $(proguard_dictionary)
+ifeq ($(LOCAL_EMMA_INSTRUMENT),true)
+proguard_flags += -include $(BUILD_SYSTEM)/proguard.emma.flags
+endif
 # If this is a test package, add proguard keep flags for tests.
 ifneq ($(strip $(LOCAL_INSTRUMENTATION_FOR)$(filter tests,$(LOCAL_MODULE_TAGS))$(filter android.test.runner,$(LOCAL_JAVA_LIBRARIES))),)
 proguard_flags := $(proguard_flags) -include $(BUILD_SYSTEM)/proguard_tests.flags

core/proguard.emma.flags

@@ -0,0 +1,4 @@
+# Keep everything for the emma classes
+-keep class com.vladium.** {
+  *;
+}