Honor ANDROID_ROOT and ANDROID_DATA

Change-Id: I8e43093830a734694bbf7308d08dd18527302270
diff --git a/src/utils.h b/src/utils.h
index d88fa2b..7807299 100644
--- a/src/utils.h
+++ b/src/utils.h
@@ -270,6 +270,12 @@
 // implementation-defined limit.
 void SetThreadName(const char* name);
 
+// Find $ANDROID_ROOT, /system, or abort
+const char* GetAndroidRoot();
+
+// Find $ANDROID_DATA, /data, or abort
+const char* GetAndroidData();
+
 // Returns the art-cache location, or dies trying.
 std::string GetArtCacheOrDie();