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

content/renderer/web_frame_utils.cc

+// 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.
+
+#include "content/renderer/web_frame_utils.h"
+
+#include "content/renderer/render_frame_impl.h"
+#include "content/renderer/render_frame_proxy.h"
+#include "ipc/ipc_message.h"
+#include "third_party/WebKit/public/web/WebFrame.h"
+
+namespace content {
+
+int GetRoutingIdForFrameOrProxy(blink::WebFrame* web_frame) {
+  if (!web_frame)
+    return MSG_ROUTING_NONE;
+  if (web_frame->isWebRemoteFrame())
+    return RenderFrameProxy::FromWebFrame(web_frame)->routing_id();
+  return RenderFrameImpl::FromWebFrame(web_frame)->GetRoutingID();
+}
+
+}  // namespace content