app_shell: Make renderer run background page JavaScript

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 70434e34e163b41db2e338c0304970c82b3c3891..d7a68b1e1e49b69b49fa11305f516d6d1a7b179c 100644
--- a/chrome/browser/extensions/extension_host.h
+++ b/chrome/browser/extensions/extension_host.h
@@ -19,6 +19,7 @@
 #include "extensions/common/stack_frame.h"
 #include "extensions/common/view_type.h"
 
+class ExtensionService;
 class PrefsTabHelper;
 
 namespace content {
@@ -128,6 +129,9 @@ class ExtensionHost : public content::WebContentsDelegate,
   // Actually create the RenderView for this host. See CreateRenderViewSoon.
   void CreateRenderViewNow();
 
+  // Returns the ExtensionService for |browser_context_| or NULL if none exists.
+  ExtensionService* GetExtensionService();
+
   // Message handlers.
   void OnRequest(const ExtensionHostMsg_Request_Params& params);
   void OnEventAck();