Initial checkin of the out of process worker implementation....

chrome/browser/worker_host/worker_process_host.h

Index: chrome/browser/worker_host/worker_process_host.h
===================================================================
--- chrome/browser/worker_host/worker_process_host.h	(revision 0)
+++ chrome/browser/worker_host/worker_process_host.h	(revision 0)
@@ -0,0 +1,56 @@
+// Copyright (c) 2009 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_WORKER_HOST_WORKER_PROCESS_HOST_H_
+#define CHROME_BROWSER_WORKER_HOST_WORKER_PROCESS_HOST_H_
+
+#include <list>
+
+#include "base/basictypes.h"
+#include "base/scoped_ptr.h"
+#include "chrome/common/child_process_host.h"
+#include "chrome/common/ipc_channel.h"
+#include "googleurl/src/gurl.h"
+
+class ResourceMessageFilter;
+
+class WorkerProcessHost : public ChildProcessHost {
+ public:
+  WorkerProcessHost(MessageLoop* main_message_loop);
+  ~WorkerProcessHost();
+
+  // Starts the process.  Returns true iff it succeeded.
+  bool Init();
+
+  // Creates a worker object in the process.
+  void CreateWorker(const GURL& url,
+                    int worker_route_id,
+                    int renderer_route_id,
+                    ResourceMessageFilter* filter);
+
+  // Returns true iff the given message from a renderer process was forwarded to
+  // the worker.
+  bool FilterMessage(const IPC::Message& message);
+
+  void RendererShutdown(ResourceMessageFilter* filter);
+
+ private:
+  // Called when a message arrives from the worker process.
+  void OnMessageReceived(const IPC::Message& message);
+
+  // Contains information about each worker instance, needed to forward messages
+  // between the renderer and worker processes.
+  struct WorkerInstance {
+    int worker_route_id;
+    int renderer_route_id;
+    ResourceMessageFilter* filter;
+  };
+
+  typedef std::list<WorkerInstance> Instances;
+  Instances instances_;
+
+  DISALLOW_COPY_AND_ASSIGN(WorkerProcessHost);
+};
+
+#endif  // CHROME_BROWSER_WORKER_HOST_WORKER_PROCESS_HOST_H_