Give nsPageBreakFrame a frame name for DEBUGging code. (Bug 468645) r+sr=bzbarsky

layout/generic/nsPageFrame.cpp

@@ -658,4 +658,10 @@ nsPageBreakFrame::GetType() const
   return nsGkAtoms::pageBreakFrame; 
 }
 
-
+#ifdef DEBUG
+NS_IMETHODIMP
+nsPageBreakFrame::GetFrameName(nsAString& aResult) const
+{
+  return MakeFrameName(NS_LITERAL_STRING("PageBreak"), aResult);
+}
+#endif

layout/generic/nsPageFrame.h

@@ -140,6 +140,10 @@ class nsPageBreakFrame : public nsLeafFrame {
 
   virtual nsIAtom* GetType() const;
 
+#ifdef NS_DEBUG
+  NS_IMETHOD  GetFrameName(nsAString& aResult) const;
+#endif
+
 protected:
 
   virtual nscoord GetIntrinsicWidth();