diff --git a/mozilla/gfx/src/photon/nsFontMetricsPh.cpp b/mozilla/gfx/src/photon/nsFontMetricsPh.cpp
index f4ead70b88a..da878df0f80 100644
--- a/mozilla/gfx/src/photon/nsFontMetricsPh.cpp
+++ b/mozilla/gfx/src/photon/nsFontMetricsPh.cpp
@@ -313,6 +313,13 @@ nsFontMetricsPh :: GetHeight(nscoord &aHeight)
   return NS_OK;
 }
 
+NS_IMETHODIMP
+nsFontMetricsPh ::GetNormalLineHeight(nscoord &aHeight)
+{
+  aHeight = mEmHeight + mLeading;
+  return NS_OK;
+}
+
 NS_IMETHODIMP
 nsFontMetricsPh :: GetLeading(nscoord &aLeading)
 {
diff --git a/mozilla/gfx/src/photon/nsFontMetricsPh.h b/mozilla/gfx/src/photon/nsFontMetricsPh.h
index fedbff12dba..196fe22622c 100644
--- a/mozilla/gfx/src/photon/nsFontMetricsPh.h
+++ b/mozilla/gfx/src/photon/nsFontMetricsPh.h
@@ -57,6 +57,7 @@ public:
   NS_IMETHOD  GetUnderline(nscoord& aOffset, nscoord& aSize);
 
   NS_IMETHOD  GetHeight(nscoord &aHeight);
+  NS_IMETHOD  GetNormalLineHeight(nscoord &aHeight);
   NS_IMETHOD  GetLeading(nscoord &aLeading);
   NS_IMETHOD  GetEmHeight(nscoord &aHeight);
   NS_IMETHOD  GetEmAscent(nscoord &aAscent);