ExtensionShelf now uses the BookmarkExtensionBackground, just like the Bookma...

chrome/renderer/render_view.h

Index: chrome/renderer/render_view.h
===================================================================
--- chrome/renderer/render_view.h	(revision 26222)
+++ chrome/renderer/render_view.h	(working copy)
@@ -405,9 +405,12 @@
   void EvaluateScript(const std::wstring& frame_xpath,
                       const std::wstring& jscript);
 
-  // Inserts a string of CSS in a particular frame.
+  // Inserts a string of CSS in a particular frame. |id| can be specified to
+  // give the CSS style element an id, and (if specified) will replace the
+  // element with the same id.
   void InsertCSS(const std::wstring& frame_xpath,
-                 const std::string& css);
+                 const std::string& css,
+                 const std::string& id);
 
   int delay_seconds_for_form_state_sync() const {
     return delay_seconds_for_form_state_sync_;
@@ -590,7 +593,8 @@
   void OnScriptEvalRequest(const std::wstring& frame_xpath,
                            const std::wstring& jscript);
   void OnCSSInsertRequest(const std::wstring& frame_xpath,
-                          const std::string& css);
+                          const std::string& css,
+                          const std::string& id);
   void OnAddMessageToConsole(const string16& frame_xpath,
                              const string16& message,
                              const WebKit::WebConsoleMessage::Level&);