C bindings pt3: Type table definitions and barebones files to get generated code to compile.

mojo/public/c/bindings/interface.h

Index: mojo/public/c/bindings/interface.h
diff --git a/mojo/public/c/bindings/interface.h b/mojo/public/c/bindings/interface.h
new file mode 100644
index 0000000000000000000000000000000000000000..7fe5d9d3ec2726e1a57d617910af953286926e65
--- /dev/null
+++ b/mojo/public/c/bindings/interface.h
@@ -0,0 +1,28 @@
+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef MOJO_PUBLIC_C_BINDINGS_INTERFACE_H_
+#define MOJO_PUBLIC_C_BINDINGS_INTERFACE_H_
+
+#include <stdint.h>
+
+#include "mojo/public/c/system/handle.h"
+#include "mojo/public/c/system/macros.h"
+
+MOJO_BEGIN_EXTERN_C
+
+// |MojomInterfaceData| represents a handle to an interface; in particular, this
+// is the client side of the interface where messages are sent and responses are
+// received. When encoded, |handle| represents the index into an array of
+// handles. The encoded version of an invalid handle is '-1' of MojoHandle type.
+struct MojomInterfaceData {
+  MojoHandle handle;
+  uint32_t version;
+};
+MOJO_STATIC_ASSERT(sizeof(struct MojomInterfaceData) == 8,
+                   "struct MojomInterfaceData must be 8 bytes.");
+
+MOJO_END_EXTERN_C
+
+#endif  // MOJO_PUBLIC_C_BINDINGS_INTERFACE_H_