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diff --git a/chromium/content/browser/frame_host/render_frame_proxy_host.h b/chromium/content/browser/frame_host/render_frame_proxy_host.h
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+// Copyright 2014 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_BROWSER_FRAME_HOST_RENDER_FRAME_PROXY_HOST_H_
+#define CONTENT_BROWSER_FRAME_HOST_RENDER_FRAME_PROXY_HOST_H_
+
+#include "base/memory/scoped_ptr.h"
+#include "content/browser/frame_host/render_frame_host_impl.h"
+#include "content/browser/site_instance_impl.h"
+#include "ipc/ipc_listener.h"
+#include "ipc/ipc_sender.h"
+
+namespace content {
+
+class CrossProcessFrameConnector;
+class FrameTreeNode;
+class RenderProcessHost;
+class RenderFrameHostImpl;
+class RenderViewHostImpl;
+class RenderWidgetHostView;
+
+// When a page's frames are rendered by multiple processes, each renderer has a
+// full copy of the frame tree. It has full RenderFrames for the frames it is
+// responsible for rendering and placeholder objects (i.e., RenderFrameProxies)
+// for frames rendered by other processes.
+//
+// This class is the browser-side host object for the placeholder. Each node in
+// the frame tree has a RenderFrameHost for the active SiteInstance and a set
+// of RenderFrameProxyHost objects - one for all other SiteInstances with
+// references to this frame. The proxies allow us to keep existing window
+// references valid over cross-process navigations and route cross-site
+// asynchronous JavaScript calls, such as postMessage.
+//
+// For now, RenderFrameProxyHost is created when a RenderFrameHost is swapped
+// out and acts just as a wrapper. It is destroyed when the RenderFrameHost is
+// swapped back in or is no longer referenced and is therefore deleted.
+//
+// Long term, RenderFrameProxyHost will be created whenever a cross-site
+// navigation occurs and a reference to the frame navigating needs to be kept
+// alive. A RenderFrameProxyHost and a RenderFrameHost for the same SiteInstance
+// can exist at the same time, but only one will be "active" at a time.
+// There are two cases where the two objects will coexist:
+// * When navigating cross-process and there is already a RenderFrameProxyHost
+// for the new SiteInstance. A pending RenderFrameHost is created, but it is
+// not used until it commits. At that point, RenderFrameHostManager transitions
+// the pending RenderFrameHost to the active one and deletes the proxy.
+// * When navigating cross-process and the existing document has an unload
+// event handler. When the new navigation commits, RenderFrameHostManager
+// creates a RenderFrameProxyHost for the old SiteInstance and uses it going
+// forward. It also instructs the RenderFrameHost to run the unload event
+// handler and is kept alive for the duration. Once the event handling is
+// complete, the RenderFrameHost is deleted.
+class RenderFrameProxyHost
+    : public IPC::Listener,
+      public IPC::Sender {
+ public:
+  RenderFrameProxyHost(SiteInstance* site_instance,
+                       FrameTreeNode* frame_tree_node);
+  virtual ~RenderFrameProxyHost();
+
+  RenderProcessHost* GetProcess() {
+    return site_instance_->GetProcess();
+  }
+
+  int GetRoutingID() {
+    return routing_id_;
+  }
+
+  SiteInstance* GetSiteInstance() {
+    return site_instance_.get();
+  }
+
+  void SetChildRWHView(RenderWidgetHostView* view);
+
+  // TODO(nasko): The following methods should be removed once we don't have a
+  // swapped out state on RenderFrameHosts. See https://crbug.com/357747.
+  RenderFrameHostImpl* render_frame_host() {
+    return render_frame_host_.get();
+  }
+  RenderViewHostImpl* GetRenderViewHost();
+
+  void TakeFrameHostOwnership(
+      scoped_ptr<RenderFrameHostImpl> render_frame_host) {
+    render_frame_host_ = render_frame_host.Pass();
+  }
+  scoped_ptr<RenderFrameHostImpl> PassFrameHostOwnership();
+
+  // IPC::Sender
+  virtual bool Send(IPC::Message* msg) OVERRIDE;
+
+  // IPC::Listener
+  virtual bool OnMessageReceived(const IPC::Message& msg) OVERRIDE;
+
+  CrossProcessFrameConnector* cross_process_frame_connector() {
+    return cross_process_frame_connector_.get();
+  }
+
+ private:
+  // This RenderFrameProxyHost's routing id.
+  int routing_id_;
+
+  // The SiteInstance this proxy is associated with.
+  scoped_refptr<SiteInstance> site_instance_;
+
+  // The node in the frame tree where this proxy is located.
+  FrameTreeNode* frame_tree_node_;
+
+  // When a RenderFrameHost is in a different process from its parent in the
+  // frame tree, this class connects its associated RenderWidgetHostView
+  // to this RenderFrameProxyHost, which corresponds to the same frame in the
+  // parent's renderer process.
+  scoped_ptr<CrossProcessFrameConnector> cross_process_frame_connector_;
+
+  // TODO(nasko): This can be removed once we don't have a swapped out state on
+  // RenderFrameHosts. See https://crbug.com/357747.
+  scoped_ptr<RenderFrameHostImpl> render_frame_host_;
+
+  DISALLOW_COPY_AND_ASSIGN(RenderFrameProxyHost);
+};
+
+}  // namespace
+
+#endif  // CONTENT_BROWSER_FRAME_HOST_RENDER_FRAME_PROXY_HOST_H_