diff -r 000000000000 -r 6474c204b198 layout/tables/nsITableLayoutStrategy.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/layout/tables/nsITableLayoutStrategy.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,55 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+// vim:cindent:ts=4:et:sw=4:
+/* 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/. */
+
+/*
+ * interface for the set of algorithms that determine column and table
+ * widths
+ */
+
+#ifndef nsITableLayoutStrategy_h_
+#define nsITableLayoutStrategy_h_
+
+#include "nscore.h"
+#include "nsCoord.h"
+
+class nsRenderingContext;
+struct nsHTMLReflowState;
+
+class nsITableLayoutStrategy
+{
+public:
+    virtual ~nsITableLayoutStrategy() {}
+
+    /** Implement nsIFrame::GetMinWidth for the table */
+    virtual nscoord GetMinWidth(nsRenderingContext* aRenderingContext) = 0;
+
+    /** Implement nsIFrame::GetPrefWidth for the table */
+    virtual nscoord GetPrefWidth(nsRenderingContext* aRenderingContext,
+                                 bool aComputingSize) = 0;
+
+    /** Implement nsIFrame::MarkIntrinsicWidthsDirty for the table */
+    virtual void MarkIntrinsicWidthsDirty() = 0;
+
+    /**
+     * Compute final column widths based on the intrinsic width data and
+     * the available width.
+     */
+    virtual void ComputeColumnWidths(const nsHTMLReflowState& aReflowState) = 0;
+
+    /**
+     * Return the type of table layout strategy, without the cost of
+     * a virtual function call
+     */
+    enum Type { Auto, Fixed };
+    Type GetType() const { return mType; }
+
+protected:
+    nsITableLayoutStrategy(Type aType) : mType(aType) {}
+private:
+    Type mType;
+};
+
+#endif /* !defined(nsITableLayoutStrategy_h_) */