Enforce naming conventions and allow empty (except for the header) types.hal files.
diff --git a/Type.cpp b/Type.cpp
index 5251f9d..136cb88 100644
--- a/Type.cpp
+++ b/Type.cpp
@@ -9,5 +9,9 @@
     return false;
 }
 
+bool Type::isInterface() const {
+    return false;
+}
+
 }  // namespace android