diff -r 000000000000 -r 6474c204b198 layout/forms/nsGfxRadioControlFrame.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/layout/forms/nsGfxRadioControlFrame.cpp	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,78 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsGfxRadioControlFrame.h"
+#include "nsRenderingContext.h"
+#include "nsDisplayList.h"
+
+using namespace mozilla;
+
+nsIFrame*
+NS_NewGfxRadioControlFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)
+{
+  return new (aPresShell) nsGfxRadioControlFrame(aContext);
+}
+
+NS_IMPL_FRAMEARENA_HELPERS(nsGfxRadioControlFrame)
+
+nsGfxRadioControlFrame::nsGfxRadioControlFrame(nsStyleContext* aContext):
+  nsFormControlFrame(aContext)
+{
+}
+
+nsGfxRadioControlFrame::~nsGfxRadioControlFrame()
+{
+}
+
+#ifdef ACCESSIBILITY
+a11y::AccType
+nsGfxRadioControlFrame::AccessibleType()
+{
+  return a11y::eHTMLRadioButtonType;
+}
+#endif
+
+//--------------------------------------------------------------
+// Draw the dot for a non-native radio button in the checked state.
+static void
+PaintCheckedRadioButton(nsIFrame* aFrame,
+                        nsRenderingContext* aCtx,
+                        const nsRect& aDirtyRect,
+                        nsPoint aPt)
+{
+  // The dot is an ellipse 2px on all sides smaller than the content-box,
+  // drawn in the foreground color.
+  nsRect rect(aPt, aFrame->GetSize());
+  rect.Deflate(aFrame->GetUsedBorderAndPadding());
+  rect.Deflate(nsPresContext::CSSPixelsToAppUnits(2),
+               nsPresContext::CSSPixelsToAppUnits(2));
+
+  aCtx->SetColor(aFrame->StyleColor()->mColor);
+  aCtx->FillEllipse(rect);
+}
+
+void
+nsGfxRadioControlFrame::BuildDisplayList(nsDisplayListBuilder*   aBuilder,
+                                         const nsRect&           aDirtyRect,
+                                         const nsDisplayListSet& aLists)
+{
+  nsFormControlFrame::BuildDisplayList(aBuilder, aDirtyRect, aLists);
+
+  if (!IsVisibleForPainting(aBuilder))
+    return;
+  
+  if (IsThemed())
+    return; // The theme will paint the check, if any.
+
+  bool checked = true;
+  GetCurrentCheckState(&checked); // Get check state from the content model
+  if (!checked)
+    return;
+    
+  aLists.Content()->AppendNewToTop(new (aBuilder)
+    nsDisplayGeneric(aBuilder, this, PaintCheckedRadioButton,
+                     "CheckedRadioButton",
+                     nsDisplayItem::TYPE_CHECKED_RADIOBUTTON));
+}