On Windows, create a new TransportDIB::Handle struct which includes the file

chrome/browser/renderer_host/browser_render_process_host.h

 // Copyright (c) 2010 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 CHROME_BROWSER_RENDERER_HOST_BROWSER_RENDER_PROCESS_HOST_H_
 #define CHROME_BROWSER_RENDERER_HOST_BROWSER_RENDER_PROCESS_HOST_H_
 #pragma once
 
 #include "build/build_config.h"
 
@@ skipping 60 matching lines @@
   virtual void ReceivedBadMessage(uint32 msg_type);
   virtual void WidgetRestored();
   virtual void WidgetHidden();
   virtual void ViewCreated();
   virtual void SendVisitedLinkTable(base::SharedMemory* table_memory);
   virtual void AddVisitedLinks(const VisitedLinkCommon::Fingerprints& links);
   virtual void ResetVisitedLinks();
   virtual bool FastShutdownIfPossible();
   virtual bool SendWithTimeout(IPC::Message* msg, int timeout_ms);
   virtual base::ProcessHandle GetHandle();
-  virtual TransportDIB* GetTransportDIB(TransportDIB::Id dib_id);
+  virtual TransportDIB* GetTransportDIB(TransportDIB::Id dib_id,
+                                        TransportDIB::Handle dib_handle);
 
   // IPC::Channel::Sender via RenderProcessHost.
   virtual bool Send(IPC::Message* msg);
 
   // IPC::Channel::Listener via RenderProcessHost.
   virtual void OnMessageReceived(const IPC::Message& msg);
   virtual void OnChannelConnected(int32 peer_pid);
   virtual void OnChannelError();
 
   // If the a process has sent a message that cannot be decoded, it is deemed
@@ skipping 86 matching lines @@
   // The host of audio renderers in the renderer process.
   scoped_refptr<AudioRendererHost> audio_renderer_host_;
 
   // A map of transport DIB ids to cached TransportDIBs
   std::map<TransportDIB::Id, TransportDIB*> cached_dibs_;
   enum {
     // This is the maximum size of |cached_dibs_|
     MAX_MAPPED_TRANSPORT_DIBS = 3,
   };
 
-  // Map a transport DIB from its Id and return it. Returns NULL on error.
-  TransportDIB* MapTransportDIB(TransportDIB::Id dib_id);
+  // Map a transport DIB from its handle. On Mac, the ID is necessary to find
+  // the appropriate file descriptor. Returns NULL on error.
+  TransportDIB* MapTransportDIB(TransportDIB::Id dib_id,
+                                TransportDIB::Handle dib_handle);
 
   void ClearTransportDIBCache();
   // This is used to clear our cache five seconds after the last use.
   base::DelayTimer<BrowserRenderProcessHost> cached_dibs_cleaner_;
 
   // Used in single-process mode.
   scoped_ptr<RendererMainThread> in_process_renderer_;
 
   // Buffer visited links and send them to to renderer.
   scoped_ptr<VisitedLinkUpdater> visited_link_updater_;
@@ skipping 11 matching lines @@
   // Messages we queue while waiting for the process handle.  We queue them here
   // instead of in the channel so that we ensure they're sent after init related
   // messages that are sent once the process handle is available.  This is
   // because the queued messages may have dependencies on the init messages.
   std::queue<IPC::Message*> queued_messages_;
 
   DISALLOW_COPY_AND_ASSIGN(BrowserRenderProcessHost);
 };
 
 #endif  // CHROME_BROWSER_RENDERER_HOST_BROWSER_RENDER_PROCESS_HOST_H_