Implement a poor man's PostAfterStartupTask() function.

content/public/browser/content_browser_client.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_CONTENT_BROWSER_CLIENT_H_
 #define CONTENT_PUBLIC_BROWSER_CONTENT_BROWSER_CLIENT_H_
 
 #include <map>
 #include <string>
 #include <utility>
@@ skipping 122 matching lines @@
 class CONTENT_EXPORT ContentBrowserClient {
  public:
   virtual ~ContentBrowserClient() {}
 
   // Allows the embedder to set any number of custom BrowserMainParts
   // implementations for the browser startup code. See comments in
   // browser_main_parts.h.
   virtual BrowserMainParts* CreateBrowserMainParts(
       const MainFunctionParams& parameters);
 
+  // Allows the embedder to change the default behavior of
+  // BrowserThread::PostAfterStartupTask to better match whatever
+  // definition of "startup" the embedder has in mind. This may be
+  // called on any thread.
+  // Note: see related BrowserThread::PostAfterStartupTask.
+  virtual void PostAfterStartupTask(
+      const tracked_objects::Location& from_here,
+      const scoped_refptr<base::TaskRunner>& task_runner,
+      const base::Closure& task);
+
   // If content creates the WebContentsView implementation, it will ask the
   // embedder to return an (optional) delegate to customize it. The view will
   // own the delegate.
   virtual WebContentsViewDelegate* GetWebContentsViewDelegate(
       WebContents* web_contents);
 
   // Notifies that a render process will be created. This is called before
   // the content layer adds its own BrowserMessageFilters, so that the
   // embedder's IPC filters have priority.
   virtual void RenderProcessWillLaunch(RenderProcessHost* host) {}
@@ skipping 464 matching lines @@
   // Allows an embedder to provide its own ExternalVideoSurfaceContainer
   // implementation.  Return nullptr to disable external surface video.
   virtual ExternalVideoSurfaceContainer*
   OverrideCreateExternalVideoSurfaceContainer(WebContents* web_contents);
 #endif
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_CONTENT_BROWSER_CLIENT_H_