Update code coverage filtering

Replaces old LOCAL_EMMA_COVERAGE_FILTER by new variables:
- LOCAL_JACK_COVERAGE_INCLUDE_FILTER for included classes
- LOCAL_JACK_COVERAGE_EXCLUDE_FILTER for excluded classes
Both variables can contain a comma-separated list of class names,
where * and ? are accepted wildcard (like foo.?ar.*).

When code coverage is enabled, we will use these variables to
pass code coverage filters on the Jack command-line.

Bug: 28014424
Change-Id: Ic29c99b6feb7ea2251c29d659e7ea1f1c46d1ed1
diff --git a/core/clear_vars.mk b/core/clear_vars.mk
index 9adb09c..8de365c 100644
--- a/core/clear_vars.mk
+++ b/core/clear_vars.mk
@@ -109,6 +109,8 @@
 # full or incremental
 LOCAL_JACK_ENABLED:=full
 LOCAL_JACK_FLAGS:=
+LOCAL_JACK_COVERAGE_INCLUDE_FILTER:=
+LOCAL_JACK_COVERAGE_EXCLUDE_FILTER:=
 LOCAL_CERTIFICATE:=
 LOCAL_SDK_VERSION:=
 LOCAL_SDK_RES_VERSION:=