Implement a poor man's PostAfterStartupTask() function.

content/public/browser/browser_thread.h

Index: content/public/browser/browser_thread.h
diff --git a/content/public/browser/browser_thread.h b/content/public/browser/browser_thread.h
index b3b42290978dab0f36a375591b388a643ab57df9..bc61e7c7f9fba53488368055e8096460366adee3 100644
--- a/content/public/browser/browser_thread.h
+++ b/content/public/browser/browser_thread.h
@@ -184,6 +184,17 @@ class CONTENT_EXPORT BrowserThread {
       const tracked_objects::Location& from_here,
       const base::Closure& task);
 
+  // For use with scheduling non-critical tasks for exeuction after startup.

[jam, 2015/03/10 23:04:34]

nit: spelling

+  // The order or execution of tasks posted here is unspecified even when
+  // posting to a SequencedTaskRunner.
+  // Note: the embedder must override ContentBrowserClient.PostAfterStartupTask
+  // to provide this function, otherwise the default behavior is to post the
+  // task immediately.

[jam, 2015/03/10 23:04:34]

nit: i think the "Note" part is confusing. it starts by making it seem like if
the CBC method isn't implemented, this method doesn't work. then it says it has
default behavior.

[michaeln, 2015/03/20 00:21:28]

Done.

// Note: see related ContentBrowserClient.PostAfterStartupTask.

+  static void PostAfterStartupTask(
+      const tracked_objects::Location& from_here,
+      const scoped_refptr<base::TaskRunner>& task_runner,
+      const base::Closure& task);
+
   // Returns the thread pool used for blocking file I/O. Use this object to
   // perform random blocking operations such as file writes or querying the
   // Windows registry.