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diff --git a/upb/bindings/googlepb/proto1.int.h b/upb/bindings/googlepb/proto1.int.h
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+++ b/upb/bindings/googlepb/proto1.int.h
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+//
+// upb - a minimalist implementation of protocol buffers.
+//
+// Copyright (c) 2011-2012 Google Inc.  See LICENSE for details.
+// Author: Josh Haberman <jhaberman@gmail.com>
+//
+// Support for registering field handlers that can write into a legacy proto1
+// message.  This functionality is only needed inside Google.
+//
+// This is an internal-only interface.
+
+#ifndef UPB_GOOGLE_PROTO1_H_
+#define UPB_GOOGLE_PROTO1_H_
+
+namespace proto2 {
+class FieldDescriptor;
+class Message;
+}
+
+namespace upb {
+class FieldDef;
+class Handlers;
+}
+
+namespace upb {
+namespace googlepb {
+
+// Sets field handlers in the given Handlers object for writing to a single
+// field (as described by "proto2_f" and "upb_f") into a message constructed
+// by the same factory as "prototype."  Returns true if this was successful
+// (this will fail if "prototype" is not a proto1 message, or if we can't
+// handle it for some reason).
+bool TrySetProto1WriteHandlers(const proto2::FieldDescriptor* proto2_f,
+                               const proto2::Message& prototype,
+                               const upb::FieldDef* upb_f, upb::Handlers* h);
+
+// Returns a prototype for the given this (possibly-weak) field.  Returns NULL
+// if this is not a submessage field of any kind (weak or no).
+const proto2::Message* GetProto1FieldPrototype(
+    const proto2::Message& m, const proto2::FieldDescriptor* f);
+
+}  // namespace googlepb
+}  // namespace upb
+
+#endif  // UPB_GOOGLE_PROTO1_H_