Callback elision for HIDL interfaces.

HIDL interface types are now elided.

Bug: 31380743
Test: mma, hidl_test, hidl_test_java
Change-Id: Ie2bcd67b9f1d8dbd4331a3c29ae1294ba75d0be7
diff --git a/Interface.h b/Interface.h
index 8542f18..847348f 100644
--- a/Interface.h
+++ b/Interface.h
@@ -31,6 +31,7 @@
 
     bool addMethod(Method *method);
 
+    bool isElidableType() const override;
     bool isInterface() const override;
     bool isBinder() const override;
     bool isRootType() const { return mSuperType == nullptr; }