Add emailcommon to Emma filter

Change-Id: I88593230bb4f594067720e75d383cad1c91cc921
diff --git a/Android.mk b/Android.mk
index 9886424..b2517a0 100644
--- a/Android.mk
+++ b/Android.mk
@@ -50,7 +50,7 @@
 
 LOCAL_PROGUARD_FLAG_FILES := proguard.flags
 
-LOCAL_EMMA_COVERAGE_FILTER := +com.android.mail.*
+LOCAL_EMMA_COVERAGE_FILTER := +com.android.mail.*, +com.android.emailcommon.*
 
 include $(BUILD_PACKAGE)