diff -r 000000000000 -r 6474c204b198 layout/mathml/nsMathMLmpaddedFrame.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/layout/mathml/nsMathMLmpaddedFrame.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,92 @@
+/* -*- 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/. */
+
+#ifndef nsMathMLmpaddedFrame_h___
+#define nsMathMLmpaddedFrame_h___
+
+#include "mozilla/Attributes.h"
+#include "nsMathMLContainerFrame.h"
+
+//
+// <mpadded> -- adjust space around content  
+//
+
+class nsMathMLmpaddedFrame : public nsMathMLContainerFrame {
+public:
+  NS_DECL_FRAMEARENA_HELPERS
+
+  friend nsIFrame* NS_NewMathMLmpaddedFrame(nsIPresShell* aPresShell, nsStyleContext* aContext);
+
+  NS_IMETHOD
+  InheritAutomaticData(nsIFrame* aParent) MOZ_OVERRIDE;
+
+  NS_IMETHOD
+  TransmitAutomaticData() MOZ_OVERRIDE {
+    return TransmitAutomaticDataForMrowLikeElement();
+  }
+
+  virtual nsresult
+  Reflow(nsPresContext*          aPresContext,
+         nsHTMLReflowMetrics&     aDesiredSize,
+         const nsHTMLReflowState& aReflowState,
+         nsReflowStatus&          aStatus) MOZ_OVERRIDE;
+  
+  virtual nsresult
+  Place(nsRenderingContext& aRenderingContext,
+        bool                 aPlaceOrigin,
+        nsHTMLReflowMetrics& aDesiredSize) MOZ_OVERRIDE;
+
+  bool
+  IsMrowLike() MOZ_OVERRIDE {
+    return mFrames.FirstChild() != mFrames.LastChild() ||
+           !mFrames.FirstChild();
+  }
+
+protected:
+  nsMathMLmpaddedFrame(nsStyleContext* aContext) : nsMathMLContainerFrame(aContext) {}
+  virtual ~nsMathMLmpaddedFrame();
+  
+  virtual nsresult
+  MeasureForWidth(nsRenderingContext& aRenderingContext,
+                  nsHTMLReflowMetrics& aDesiredSize) MOZ_OVERRIDE;
+
+private:
+  nsCSSValue mWidth;
+  nsCSSValue mHeight;
+  nsCSSValue mDepth;
+  nsCSSValue mLeadingSpace;
+  nsCSSValue mVerticalOffset;
+
+  int32_t    mWidthSign;
+  int32_t    mHeightSign;
+  int32_t    mDepthSign;
+  int32_t    mLeadingSpaceSign;
+  int32_t    mVerticalOffsetSign;
+
+  int32_t    mWidthPseudoUnit;
+  int32_t    mHeightPseudoUnit;
+  int32_t    mDepthPseudoUnit;
+  int32_t    mLeadingSpacePseudoUnit;
+  int32_t    mVerticalOffsetPseudoUnit;
+
+  // helpers to process the attributes
+  void
+  ProcessAttributes();
+
+  static bool
+  ParseAttribute(nsString&   aString,
+                 int32_t&    aSign,
+                 nsCSSValue& aCSSValue,
+                 int32_t&    aPseudoUnit);
+
+  void
+  UpdateValue(int32_t                  aSign,
+              int32_t                  aPseudoUnit,
+              const nsCSSValue&        aCSSValue,
+              const nsHTMLReflowMetrics& aDesiredSize,
+              nscoord&                 aValueToUpdate) const;
+};
+
+#endif /* nsMathMLmpaddedFrame_h___ */