Implement a poor man's PostAfterStartupTask() function.

content/public/browser/after_startup_task_poster.h

Index: content/public/browser/after_startup_task_poster.h
diff --git a/content/public/browser/after_startup_task_poster.h b/content/public/browser/after_startup_task_poster.h
new file mode 100644
index 0000000000000000000000000000000000000000..9f76b9c25dab8bd77fcac3a097996428f6779bfb
--- /dev/null
+++ b/content/public/browser/after_startup_task_poster.h
@@ -0,0 +1,32 @@
+// Copyright (c) 2015 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_AFTER_STARTUP_TASK_POSTER_H_
+#define CONTENT_PUBLIC_BROWSER_AFTER_STARTUP_TASK_POSTER_H_
+
+#include "base/bind.h"
+#include "base/location.h"
+#include "base/memory/ref_counted.h"
+#include "base/task_runner.h"
+#include "content/common/content_export.h"
+
+namespace content {
+
+class CONTENT_EXPORT AfterStartupTaskPoster {
+ public:
+  virtual void PostAfterStartup(
+      const tracked_objects::Location& from_here,
+      const scoped_refptr<base::TaskRunner>& task_runner,
+      const base::Closure& task) = 0;
+
+  virtual void PostAfterStartupAndReply(
+      const tracked_objects::Location& from_here,
+      const scoped_refptr<base::TaskRunner>& task_runner,
+      const base::Closure& task,
+      const base::Closure& reply) = 0;
+};
+
+}  // namespace content
+
+#endif  // CONTENT_PUBLIC_BROWSER_AFTER_STARTUP_TASK_POSTER_H_