Allow target to override preloaded-classes file

Change-Id: I0cd6cd802b21314c6e60233864870664fc08ac2c
Signed-off-by: Mike Lockwood <lockwood@android.com>
diff --git a/Android.mk b/Android.mk
index a8c4612..4f62d78 100644
--- a/Android.mk
+++ b/Android.mk
@@ -220,7 +220,11 @@
 LOCAL_NO_EMMA_COMPILE := true
 
 # List of classes and interfaces which should be loaded by the Zygote.
+ifneq ($(TARGET_PRELOADED_CLASSES),)
+LOCAL_JAVA_RESOURCE_FILES += $(TARGET_PRELOADED_CLASSES)
+else
 LOCAL_JAVA_RESOURCE_FILES += $(LOCAL_PATH)/preloaded-classes
+endif
 
 #LOCAL_JARJAR_RULES := $(LOCAL_PATH)/jarjar-rules.txt