I love how XRefs in Chromium Code Search now have an expandable list of callers - this makes it easy to see the transitive closure of all the callers of a particular method or function.

I would like to see something similar for class hierarchies - right now "Subclasses" section of XRefs only contains *immediate* children of a class, but doesn't contain the grandchildren.  For example - when looking at XRefs of blink::HTMLElement, I see that blink::HTMLFrameOwnerElement is one of the subclasses.  It would be great if I could "expand" blink::HTMLFrameOwnerElement to see that its subclass tree also includes blink::HTMLFrameElementBase and blink::HTMLPlugInElement (and that blink::HTMLFrameElementBase includes blink::HTMLFrameElement as well as blink::HTMLIFrameElement).