This defers starting background extension page RenderViews

chrome/browser/extensions/extension_host.h

Index: chrome/browser/extensions/extension_host.h
diff --git a/chrome/browser/extensions/extension_host.h b/chrome/browser/extensions/extension_host.h
index fe97ef2ad5460dc7bef423996d0f3b4b575c9aff..5e1864753d773a6e825ea6d45e1a479782062588 100644
--- a/chrome/browser/extensions/extension_host.h
+++ b/chrome/browser/extensions/extension_host.h
@@ -127,9 +127,20 @@ class ExtensionHost : public content::WebContentsDelegate,
 
   // Prepares to initializes our RenderViewHost by creating its RenderView and
   // navigating to this host's url. Uses host_view for the RenderViewHost's view
-  // (can be NULL). This happens delayed to avoid locking the UI.
+  // (can be NULL). This happens in a rate limited fashion to avoid locking the
+  // UI.
   void CreateRenderViewSoon();
 
+  // Does the same thing as CreateRenderViewSoon, but only adds the creation to
+  // a queue.  Creation of these deferred views then happens when
+  // CreateDeferredRenderViews is called.
+  void CreateRenderViewDeferred();
+
+  // Creates any render views that have been deferred because
+  // CreateRenderViewDeferred was called.  This happens in a rate limited
+  // fashion to avoid locking the UI.
+  static void CreateDeferredRenderViews();
+
   // Insert a default style sheet for Extension Infobars.
   void InsertInfobarCSS();