Implement a poor man's PostAfterStartupTask() function.

content/public/browser/content_browser_client.h

Index: content/public/browser/content_browser_client.h
diff --git a/content/public/browser/content_browser_client.h b/content/public/browser/content_browser_client.h
index c4ab6f347f3c5b847083fb74bc89742f329f6716..87faab2ba6348044aeb481e9446a5dc02e8567ea 100644
--- a/content/public/browser/content_browser_client.h
+++ b/content/public/browser/content_browser_client.h
@@ -83,6 +83,7 @@ class FileSystemBackend;
 namespace content {
 
 class AccessTokenStore;
+class AfterStartupTaskPoster;
 class BrowserChildProcessHost;
 class BrowserContext;
 class BrowserMainParts;
@@ -141,6 +142,11 @@ class CONTENT_EXPORT ContentBrowserClient {
   virtual BrowserMainParts* CreateBrowserMainParts(
       const MainFunctionParams& parameters);
 
+  // Allows the embedder to defer the posting of non-critical tasks until
+  // after the "startup" is complete. The default implementation does no
+  // deferral.
+  virtual AfterStartupTaskPoster* GetAfterStartupTaskPoster();
+
   // 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.