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 c5c3942d749cc211489a01c8b1d6f7f22e961cd5..39431f8d5941d2dfd83742779256b80ad87e9d32 100644
--- a/content/public/browser/content_browser_client.h
+++ b/content/public/browser/content_browser_client.h
@@ -141,6 +141,14 @@ class CONTENT_EXPORT ContentBrowserClient {
   virtual BrowserMainParts* CreateBrowserMainParts(
       const MainFunctionParams& parameters);
 
+  // Allows the embedder to defer the posting of non-critical tasks until
+  // after "startup" is complete for whatever definition of startup the
+  // embedder has. The default implementation does no deferral.
+  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.