Added --custom-launcher-page. Adds a page to the experimental launcher.

ui/app_list/app_list_view_delegate.h

Index: ui/app_list/app_list_view_delegate.h
diff --git a/ui/app_list/app_list_view_delegate.h b/ui/app_list/app_list_view_delegate.h
index cf6fa53efe6c8428cf689b549def282c83d440ce..606e218251bf81036f1d5a0e0c78bd6aad54b235 100644
--- a/ui/app_list/app_list_view_delegate.h
+++ b/ui/app_list/app_list_view_delegate.h
@@ -139,6 +139,10 @@ class APP_LIST_EXPORT AppListViewDelegate {
   // Creates the web view for the start page. The caller takes the ownership of
   // the returned view.
   virtual views::View* CreateStartPageWebView(const gfx::Size& size) = 0;
+
+  // Creates the web view for the user-specified custom page. May return NULL.
+  // The caller takes ownership of the returned view.
+  virtual views::View* CreateCustomPageWebView(const gfx::Size& size) = 0;
 #endif
 
   // Returns true if the delegate supports speech recognition.