Fix stuck tabbing through imagemaps (bug 124789) by tracking the focused frame separately from the focused content node in this case. r=jkeiser, sr=bzbarsky.

content/events/public/nsIEventStateManager.h

@@ -90,6 +90,8 @@ public:
   NS_IMETHOD GetFocusedContent(nsIContent **aContent) = 0;
   NS_IMETHOD SetFocusedContent(nsIContent* aContent) = 0;
 
+  NS_IMETHOD GetFocusedFrame(nsIFrame **aFrame) = 0;
+
   NS_IMETHOD ContentRemoved(nsIContent* aContent) = 0;
   NS_IMETHOD EventStatusOK(nsGUIEvent* aEvent, PRBool *aOK) = 0;