Add options for building/testing with coverage.

    acov --clean
    mm -B NATIVE_COVERAGE=true ART_COVERAGE=true test-art-host
    acov --host

-B is needed because you need to be sure you rebuild *all* of ART with
coverage.

Change-Id: Ib94ef610bd1b44dc45624877710ed733051b7a50
diff --git a/dalvikvm/Android.mk b/dalvikvm/Android.mk
index 239e746..8afd443 100644
--- a/dalvikvm/Android.mk
+++ b/dalvikvm/Android.mk
@@ -35,6 +35,7 @@
 LOCAL_MULTILIB := both
 LOCAL_MODULE_STEM_32 := dalvikvm32
 LOCAL_MODULE_STEM_64 := dalvikvm64
+LOCAL_NATIVE_COVERAGE := $(ART_COVERAGE)
 include $(BUILD_EXECUTABLE)
 
 # Create symlink for the primary version target.
@@ -67,6 +68,7 @@
 LOCAL_MULTILIB := both
 LOCAL_MODULE_STEM_32 := dalvikvm32
 LOCAL_MODULE_STEM_64 := dalvikvm64
+LOCAL_NATIVE_COVERAGE := $(ART_COVERAGE)
 include $(BUILD_HOST_EXECUTABLE)
 
 # Create symlink for the primary version target.