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

chrome/browser/ui/toolbar/toolbar_model.h

Index: chrome/browser/ui/toolbar/toolbar_model.h
diff --git a/chrome/browser/ui/toolbar/toolbar_model.h b/chrome/browser/ui/toolbar/toolbar_model.h
index c9aead57fff741cfa46fb07dc355dc6b48afb5a5..4ab51b9504392865eb0c4b062033ae212424fce6 100644
--- a/chrome/browser/ui/toolbar/toolbar_model.h
+++ b/chrome/browser/ui/toolbar/toolbar_model.h
@@ -70,6 +70,11 @@ class ToolbarModel {
   // in the location bar.
   virtual bool ShouldDisplayURL() const = 0;
 
+  // Queries the delegate WebContent's WebUI and returns true when the URL
+  // for the current navigation entry should be entirely greyed out in the
+  // location bar.

[Peter Kasting, 2013/04/03 22:32:13]

Nit: The comment shouldn't be talking about implementation detail so much.  Just
say:

// Returns whether the URL for the current navigation entry should be displayed
in all grey, as opposed to with the host in black (the default behavior).

[Patrick Riordan, 2013/04/04 01:01:37]

Done.

+  virtual bool ShouldGreyOutURL() const = 0;
+
   // Getter/setter of whether the text in location bar is currently being
   // edited.
   virtual void SetInputInProgress(bool value) = 0;