Set up content in-process main threads via factory

content/renderer/renderer_main_thread.cc

Index: content/renderer/renderer_main_thread.cc
diff --git a/content/renderer/renderer_main_thread.cc b/content/renderer/renderer_main_thread.cc
new file mode 100644
index 0000000000000000000000000000000000000000..c6704c83c5d38263c7c2c6f53e6154371f21803b
--- /dev/null
+++ b/content/renderer/renderer_main_thread.cc
@@ -0,0 +1,45 @@
+// Copyright 2013 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.
+
+#include "content/renderer/renderer_main_thread.h"
+
+#include "content/renderer/render_process.h"
+#include "content/renderer/render_process_impl.h"
+#include "content/renderer/render_thread_impl.h"
+
+namespace content {
+
+RendererMainThread::RendererMainThread(const std::string& channel_id)
+    : Thread("Chrome_InProcRendererThread"), channel_id_(channel_id) {
+}
+
+RendererMainThread::~RendererMainThread() {
+  Stop();
+}
+
+void RendererMainThread::Init() {
+  render_process_.reset(new RenderProcessImpl());
+  new RenderThreadImpl(channel_id_);
+}
+
+void RendererMainThread::CleanUp() {
+  render_process_.reset();
+
+  // It's a little lame to manually set this flag.  But the single process
+  // RendererThread will receive the WM_QUIT.  We don't need to assert on
+  // this thread, so just force the flag manually.
+  // If we want to avoid this, we could create the InProcRendererThread
+  // directly with _beginthreadex() rather than using the Thread class.
+  // We used to set this flag in the Init function above. However there
+  // other threads like WebThread which are created by this thread
+  // which resets this flag. Please see Thread::StartWithOptions. Setting
+  // this flag to true in Cleanup works around these problems.
+  SetThreadWasQuitProperly(true);
+}
+
+base::Thread* CreateRendererMainThread(const std::string& channel_id) {
+  return new RendererMainThread(channel_id);
+}
+
+}  // namespace content