Expose minContentWidth/maxContentWidth and a callback for computing them.

sky/engine/core/rendering/RenderBox.cpp

Index: sky/engine/core/rendering/RenderBox.cpp
diff --git a/sky/engine/core/rendering/RenderBox.cpp b/sky/engine/core/rendering/RenderBox.cpp
index 2b0716e0eae679c1e2b64d9d142d675019735f19..59acacea1dcec48cc0d953072615bd69f7344d5b 100644
--- a/sky/engine/core/rendering/RenderBox.cpp
+++ b/sky/engine/core/rendering/RenderBox.cpp
@@ -388,6 +388,16 @@ LayoutUnit RenderBox::maxPreferredLogicalWidth() const
     return m_maxPreferredLogicalWidth;
 }
 
+void RenderBox::setMinPreferredLogicalWidth(LayoutUnit width)
+{
+    m_minPreferredLogicalWidth = width;
+}
+
+void RenderBox::setMaxPreferredLogicalWidth(LayoutUnit width)
+{
+    m_maxPreferredLogicalWidth = width;
+}
+
 bool RenderBox::hasOverrideHeight() const
 {
     return m_rareData && m_rareData->m_overrideLogicalContentHeight != -1;