Implement sidebar support for extension action popups

chrome/browser/extensions/extension_view_host_factory.h

Index: chrome/browser/extensions/extension_view_host_factory.h
diff --git a/chrome/browser/extensions/extension_view_host_factory.h b/chrome/browser/extensions/extension_view_host_factory.h
index 5bc388c38e6a555a3c34193662000e4c60a67831..f8e1e3750cacaf0f21a1897730c298eecbbfca69 100644
--- a/chrome/browser/extensions/extension_view_host_factory.h
+++ b/chrome/browser/extensions/extension_view_host_factory.h
@@ -28,6 +28,12 @@ class ExtensionViewHostFactory {
   // hence only require a |profile|.
   static ExtensionViewHost* CreateDialogHost(const GURL& url, Profile* profile);
 
+  // Creates a new ExtensionHost with its associated view, grouping it in the
+  // appropriate SiteInstance (and therefore process) based on the URL and
+  // profile.
+  static ExtensionViewHost* CreateSidebarHost(const GURL& url,
+                                              Browser* browser);
+
  private:
   DISALLOW_COPY_AND_ASSIGN(ExtensionViewHostFactory);
 };