attachment broker wip

content/public/common/child_process_host.h

Index: content/public/common/child_process_host.h
diff --git a/content/public/common/child_process_host.h b/content/public/common/child_process_host.h
index c79938b405f82d6c0d591730d0cf59c31c766aac..dc288719e8a63adeb7036c0a6cceba843c8b23dd 100644
--- a/content/public/common/child_process_host.h
+++ b/content/public/common/child_process_host.h
@@ -15,6 +15,7 @@ class FilePath;
 }
 
 namespace IPC {
+class AttachmentBroker;
 class MessageFilter;
 }
 
@@ -83,6 +84,13 @@ class CONTENT_EXPORT ChildProcessHost : public IPC::Sender {
   // 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;