Propagate 'this_object' for method unwind event.

Propagates the 'this_object' to InstrumentationListener::MethodUnwind callback.

Change-Id: I12561f1a611b8399b94e669f9b8a6eaaf1a58631
diff --git a/runtime/trace.h b/runtime/trace.h
index ffcb36d..9be015a 100644
--- a/runtime/trace.h
+++ b/runtime/trace.h
@@ -79,7 +79,8 @@
                             const mirror::ArtMethod* method, uint32_t dex_pc,
                             const JValue& return_value)
       SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
-  virtual void MethodUnwind(Thread* thread, const mirror::ArtMethod* method, uint32_t dex_pc)
+  virtual void MethodUnwind(Thread* thread, mirror::Object* this_object,
+                            const mirror::ArtMethod* method, uint32_t dex_pc)
       SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
   virtual void DexPcMoved(Thread* thread, mirror::Object* this_object,
                           const mirror::ArtMethod* method, uint32_t new_dex_pc)