1 files changed, 19 insertions, 1 deletions
diff --git a/Source/WebCore/rendering/RenderView.h b/Source/WebCore/rendering/RenderView.h
index 0f5c6e881..084d7d5a7 100644
--- a/Source/WebCore/rendering/RenderView.h
+++ b/Source/WebCore/rendering/RenderView.h
@@ -124,9 +124,27 @@ public:
     }
     void addLayoutDelta(const LayoutSize& delta) 
     {
-        if (m_layoutState)
+        if (m_layoutState) {
             m_layoutState->m_layoutDelta += delta;
+#if !ASSERT_DISABLED && ENABLE(SATURATED_LAYOUT_ARITHMETIC)
+            m_layoutState->m_layoutDeltaXSaturated |= m_layoutState->m_layoutDelta.width() == FractionalLayoutUnit::max() || m_layoutState->m_layoutDelta.width() == FractionalLayoutUnit::min();
+            m_layoutState->m_layoutDeltaYSaturated |= m_layoutState->m_layoutDelta.height() == FractionalLayoutUnit::max() || m_layoutState->m_layoutDelta.height() == FractionalLayoutUnit::min();
+#endif
+        }
+    }
+    
+#if !ASSERT_DISABLED
+    bool layoutDeltaMatches(const LayoutSize& delta)
+    {
+        if (!m_layoutState)
+            return false;
+#if ENABLE(SATURATED_LAYOUT_ARITHMETIC)
+        return (delta.width() == m_layoutState->m_layoutDelta.width() || m_layoutState->m_layoutDeltaXSaturated) && (delta.height() == m_layoutState->m_layoutDelta.height() || m_layoutState->m_layoutDeltaYSaturated);
+#else
+        return delta == m_layoutState->m_layoutDelta;
+#endif
     }
+#endif
 
     bool doingFullRepaint() const { return m_frameView->needsFullRepaint(); }