attachment broker wip

content/public/common/child_process_host.h

 // Copyright (c) 2012 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_PUBLIC_COMMON_CHILD_PROCESS_HOST_H_
 #define CONTENT_PUBLIC_COMMON_CHILD_PROCESS_HOST_H_
 
 #include "base/files/scoped_file.h"
 #include "build/build_config.h"
 #include "content/common/content_export.h"
 #include "ipc/ipc_channel_proxy.h"
 
 namespace base {
 class FilePath;
 }
 
 namespace IPC {
+class AttachmentBroker;
 class MessageFilter;
 }
 
 namespace content {
 
 class ChildProcessHostDelegate;
 
 // This represents a non-browser process. This can include traditional child
 // processes like plugins, or an embedder could even use this for long lived
 // processes that run independent of the browser process.
@@ skipping 48 matching lines @@
   // the default child process pathname will be returned.  On most platforms,
   // this will be the same as the currently-executing process.
   //
   // The |flags| argument accepts one or more flags such as CHILD_ALLOW_SELF
   // and CHILD_ALLOW_HEAP_EXECUTION as defined above. Pass only CHILD_NORMAL
   // if none of these special behaviors are required.
   //
   // On failure, returns an empty FilePath.
   static base::FilePath GetChildPath(int flags);
 
+  // Returns an AttachmentBroker used to broker attachments of IPC messages to
+  // child processes. This method is only useful in the embedder, and only
+  // because a particular embedder (Chrome) is bad at avoiding the use of
+  // singletons. Child processes should find a cleaner way of passing around an
+  // AttachmentBroker.
+  static IPC::AttachmentBroker* GetAttachmentBroker();
+
   // Send the shutdown message to the child process.
   // Does not check with the delegate's CanShutdown.
   virtual void ForceShutdown() = 0;
 
   // Creates the IPC channel.  Returns the channel id if it succeeded, an
   // empty string otherwise
   virtual std::string CreateChannel() = 0;
 
   // Returns true iff the IPC channel is currently being opened;
   virtual bool IsChannelOpening() = 0;
 
   // Adds an IPC message filter.  A reference will be kept to the filter.
   virtual void AddFilter(IPC::MessageFilter* filter) = 0;
 
 #if defined(OS_POSIX)
   // See IPC::Channel::TakeClientFileDescriptor.
   virtual base::ScopedFD TakeClientFileDescriptor() = 0;
 #endif
 };
 
 };  // namespace content
 
 #endif  // CONTENT_PUBLIC_COMMON_CHILD_PROCESS_HOST_H_