mojo: break struct headers into headers and source

mojo/public/bindings/generators/module_interface.h

Index: mojo/public/bindings/generators/module_interface.h
diff --git a/mojo/public/bindings/generators/module_interface.h b/mojo/public/bindings/generators/module_interface.h
new file mode 100644
index 0000000000000000000000000000000000000000..d7c19dbbdc57914e69c141dda50c8a70695dd69b
--- /dev/null
+++ b/mojo/public/bindings/generators/module_interface.h
@@ -0,0 +1,19 @@
+// Copyright $YEAR 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 $HEADER_GUARD
+#define $HEADER_GUARD
+
+#include "mojo/public/bindings/lib/bindings.h"
+
+namespace $NAMESPACE {
+$FORWARDS
+class $CLASS {
+ public:
+$METHODS
+};
+
+}  // namespace $NAMESPACE
+
+#endif  // $HEADER_GUARD