Shows chrome-extension urls and greys out the whole url.

content/public/browser/web_ui.h

Index: content/public/browser/web_ui.h
diff --git a/content/public/browser/web_ui.h b/content/public/browser/web_ui.h
index 3e72a64d1b6b629cd72a12fa21570b38d6e91a4a..c5d4b947158814e84f191c578124428f6d84ad1e 100644
--- a/content/public/browser/web_ui.h
+++ b/content/public/browser/web_ui.h
@@ -72,6 +72,11 @@ class CONTENT_EXPORT WebUI {
   virtual bool ShouldHideURL() const = 0;
   virtual void HideURL() = 0;
 
+  // Returns true if the pages URL should be entirely greyed out. Currently
+  // this is only the case for chrome-extension:// URLs.
+  virtual bool ShouldGreyOutURL() const = 0;
+  virtual void GreyOutURL() = 0;
+
   // Gets a custom tab title provided by the Web UI. If there is no title
   // override, the string will be empty which should trigger the default title
   // behavior for the tab.