Implement sidebar support for extension action popups

extensions/browser/extension_host.h

Index: extensions/browser/extension_host.h
diff --git a/extensions/browser/extension_host.h b/extensions/browser/extension_host.h
index 3ae0d869c897ecbbccfa487a4f88be71ff093388..974e546e305d1ff76db0fb3f8c30edc9c58b5a0a 100644
--- a/extensions/browser/extension_host.h
+++ b/extensions/browser/extension_host.h
@@ -139,6 +139,9 @@ class ExtensionHost : public DeferredStartRenderHost,
   // Navigates to the initial page.
   virtual void LoadInitialURL();
 
+  // Navigates to the page.
+  virtual void LoadURL(const GURL& url);
+
   // Returns true if we're hosting a background page.
   virtual bool IsBackgroundPage() const;