diff --git a/layout/base/src/nsFrame.cpp b/layout/base/src/nsFrame.cpp
index 47b801aa4988..2ac7ea1f0c01 100644
--- a/layout/base/src/nsFrame.cpp
+++ b/layout/base/src/nsFrame.cpp
@@ -31,6 +31,7 @@
 #include "prlog.h"
 #include "prprf.h"
 #include <stdarg.h>
+#include "nsIPtr.h"
 
 #define DO_SELECTION 0
 
@@ -40,6 +41,9 @@
 #include "nsIDeviceContext.h"
 #include "nsIPresShell.h"
 
+NS_DEF_PTR(nsIView);
+NS_DEF_PTR(nsIViewManager);
+
 // Kludged Content stuff
 nsIFrame   * fFrameArray[1024];
 nsIContent * fContentArray[1024];
@@ -1255,6 +1259,26 @@ NS_METHOD nsFrame::GetWindow(nsIWidget*& aWindow) const
   return NS_OK;
 }
 
+void nsFrame::Invalidate(const nsRect& aDamageRect) const
+{
+  nsIViewManagerPtr viewManager;
+
+  if (nsnull != mView) {
+    viewManager = mView->GetViewManager();
+    viewManager->UpdateView(mView, aDamageRect, 0);
+    
+  } else {
+    nsRect      rect(aDamageRect);
+    nsPoint     offset;
+    nsIViewPtr  view;
+  
+    GetOffsetFromView(offset, view.AssignRef());
+    NS_ASSERTION(nsnull != view, "no view");
+    rect += offset;
+    viewManager = view->GetViewManager();
+    viewManager->UpdateView(view, rect, 0);
+  }
+}
 
 // Style sizing methods
 NS_METHOD nsFrame::IsPercentageBase(PRBool& aBase) const
diff --git a/layout/base/src/nsFrame.h b/layout/base/src/nsFrame.h
index 2225e433e445..044d2bb47668 100644
--- a/layout/base/src/nsFrame.h
+++ b/layout/base/src/nsFrame.h
@@ -77,6 +77,7 @@ public:
                            nsIContent* aContent,
                            nsIFrame*   aParent);
 
+  // nsISupports
   NS_IMETHOD  QueryInterface(const nsIID& aIID, void** aInstancePtr);
 
   // Overloaded new operator. Initializes the memory to 0
@@ -84,6 +85,7 @@ public:
 
   NS_IMETHOD  DeleteFrame();
 
+  // nsIFrame
   NS_IMETHOD  GetContent(nsIContent*& aContent) const;
   NS_IMETHOD  GetContentIndex(PRInt32& aIndexInParent) const;
 
@@ -131,7 +133,7 @@ public:
   NS_IMETHOD  GetFrameState(nsFrameState& aResult);
   NS_IMETHOD  SetFrameState(nsFrameState aNewState);
 
-  // Resize reflow methods
+  // Reflow methods
   NS_IMETHOD  WillReflow(nsIPresContext& aPresContext);
   NS_IMETHOD  DidReflow(nsIPresContext& aPresContext,
                         nsDidReflowStatus aStatus);
@@ -208,6 +210,10 @@ public:
   NS_IMETHOD  GetNextSibling(nsIFrame*& aNextSibling) const;
   NS_IMETHOD  SetNextSibling(nsIFrame* aNextSibling);
 
+  // Invalidate part of the frame by asking the view manager to repaint.
+  // aDamageRect is in the frame's local coordinate space
+  void        Invalidate(const nsRect& aDamageRect) const;
+
   // Debugging
   NS_IMETHOD  List(FILE* out = stdout, PRInt32 aIndent = 0) const;
   NS_IMETHOD  ListTag(FILE* out = stdout) const;