Set up content in-process main threads via factory

content/public/browser/render_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_BROWSER_RENDER_PROCESS_HOST_H_
 #define CONTENT_PUBLIC_BROWSER_RENDER_PROCESS_HOST_H_
 
 #include "base/basictypes.h"
 #include "base/id_map.h"
 #include "base/process/kill.h"
@@ skipping 12 matching lines @@
 class RenderWidgetHost;
 class StoragePartition;
 }
 
 namespace base {
 class TimeDelta;
 }
 
 namespace content {
 
+typedef base::Thread* (*RendererMainThreadFactoryFunction)(
+    const std::string& id);
+
 // Interface that represents the browser side of the browser <-> renderer
 // communication channel. There will generally be one RenderProcessHost per
 // renderer process.
 class CONTENT_EXPORT RenderProcessHost : public IPC::Sender,
                                          public IPC::Listener {
  public:
   typedef IDMap<RenderProcessHost>::iterator iterator;
 
   // Details for RENDERER_PROCESS_CLOSED notifications.
   struct RendererClosedDetails {
@@ skipping 198 matching lines @@
   // Overrides the default heuristic for limiting the max renderer process
   // count.  This is useful for unit testing process limit behaviors.  It is
   // also used to allow a command line parameter to configure the max number of
   // renderer processes and should only be called once during startup.
   // A value of zero means to use the default heuristic.
   static void SetMaxRendererProcessCount(size_t count);
 
   // Returns the current max number of renderer processes used by the content
   // module.
   static size_t GetMaxRendererProcessCount();
+
+  static void RegisterRendererMainThreadFactory(
+      RendererMainThreadFactoryFunction create);
 };
 
 }  // namespace content.
 
 #endif  // CONTENT_PUBLIC_BROWSER_RENDER_PROCESS_HOST_H_