mojo: break struct headers into headers and source

mojo/public/bindings/generators/module_struct.h

+// 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
+#pragma pack(push, 1)
+
+class $CLASS {
+ public:
+  static $CLASS* New(mojo::Buffer* buf);
+
+$SETTERS
+
+$GETTERS
+
+ private:
+  friend class mojo::internal::ObjectTraits<$CLASS>;
+
+  $CLASS();
+  ~$CLASS();  // NOT IMPLEMENTED
+
+  mojo::internal::StructHeader _header_;
+$FIELDS
+};
+
+MOJO_COMPILE_ASSERT(sizeof($CLASS) == $SIZE, bad_sizeof_$CLASS);
+
+#pragma pack(pop)
+
+}  // namespace $NAMESPACE
+
+#endif  // $HEADER_GUARD