diff --git a/runtime/openjdkjvmti/ti_class_loader.h b/runtime/openjdkjvmti/ti_class_loader.h
new file mode 100644
index 0000000..17ed0eb
--- /dev/null
+++ b/runtime/openjdkjvmti/ti_class_loader.h
@@ -0,0 +1,96 @@
+/* Copyright (C) 2017 The Android Open Source Project
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This file implements interfaces from the file jvmti.h. This implementation
+ * is licensed under the same terms as the file jvmti.h.  The
+ * copyright and license information for the file jvmti.h follows.
+ *
+ * Copyright (c) 2003, 2011, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+#ifndef ART_RUNTIME_OPENJDKJVMTI_TI_CLASS_LOADER_H_
+#define ART_RUNTIME_OPENJDKJVMTI_TI_CLASS_LOADER_H_
+
+#include <string>
+
+#include <jni.h>
+
+#include "art_jvmti.h"
+#include "art_method.h"
+#include "base/array_slice.h"
+#include "class_linker.h"
+#include "dex_file.h"
+#include "gc_root-inl.h"
+#include "globals.h"
+#include "jni_env_ext-inl.h"
+#include "jvmti.h"
+#include "linear_alloc.h"
+#include "mem_map.h"
+#include "mirror/array-inl.h"
+#include "mirror/array.h"
+#include "mirror/class-inl.h"
+#include "mirror/class.h"
+#include "mirror/class_loader-inl.h"
+#include "mirror/string-inl.h"
+#include "oat_file.h"
+#include "obj_ptr.h"
+#include "scoped_thread_state_change-inl.h"
+#include "stack.h"
+#include "ti_class_definition.h"
+#include "thread_list.h"
+#include "transform.h"
+#include "utf.h"
+#include "utils/dex_cache_arrays_layout-inl.h"
+
+namespace openjdkjvmti {
+
+// Class that can redefine a single class's methods.
+// TODO We should really make this be driven by an outside class so we can do multiple classes at
+// the same time and have less required cleanup.
+class ClassLoaderHelper {
+ public:
+  static bool AddToClassLoader(art::Thread* self,
+                               art::Handle<art::mirror::ClassLoader> loader,
+                               const art::DexFile* dex_file)
+      REQUIRES_SHARED(art::Locks::mutator_lock_);
+
+  // Finds a java.lang.DexFile object that is associated with the given ClassLoader. Each of these
+  // j.l.DexFile objects holds several art::DexFile*s in it.
+  // TODO This should return the actual source java.lang.DexFile object for the klass being loaded.
+  static art::ObjPtr<art::mirror::Object> FindSourceDexFileObject(
+      art::Thread* self, art::Handle<art::mirror::ClassLoader> loader)
+      REQUIRES_SHARED(art::Locks::mutator_lock_);
+
+  static art::ObjPtr<art::mirror::LongArray> AllocateNewDexFileCookie(
+      art::Thread* self,
+      art::Handle<art::mirror::Object> java_dex_file,
+      const art::DexFile* new_dex_file) REQUIRES_SHARED(art::Locks::mutator_lock_);
+
+  static void UpdateJavaDexFile(art::ObjPtr<art::mirror::Object> java_dex_file,
+                                art::ObjPtr<art::mirror::LongArray> new_cookie)
+      REQUIRES(art::Roles::uninterruptible_) REQUIRES_SHARED(art::Locks::mutator_lock_);
+};
+
+}  // namespace openjdkjvmti
+#endif  // ART_RUNTIME_OPENJDKJVMTI_TI_CLASS_LOADER_H_