Vector-of-structs (instead of struct-of-vectors) in "savable resources" IPC.

content/common/savable_subframe.h

+// Copyright 2015 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 CONTENT_COMMON_SAVABLE_SUBFRAME_H_
+#define CONTENT_COMMON_SAVABLE_SUBFRAME_H_
+
+#include "url/gurl.h"
+
+namespace content {
+
+// Information about a subframe being saved as "complete html".
+struct SavableSubframe {
+  // Original url of the subframe (i.e. based the parent's html sources).
+  GURL original_url;
+
+  // Routing ID of the RenderFrame or RenderFrameProxy for the subframe.
+  int routing_id;
+};
+
+}  // namespace content
+
+#endif  // CONTENT_COMMON_SAVABLE_SUBFRAME_H_