Split getIntrinsicDimensions into four pieces

sky/sdk/lib/framework/rendering/flex.dart

Index: sky/sdk/lib/framework/rendering/flex.dart
diff --git a/sky/sdk/lib/framework/rendering/flex.dart b/sky/sdk/lib/framework/rendering/flex.dart
index 1a0a1f61d1a0760f3a0749ae573f818e02d81366..0a1921dbe225597e5f00d73c62b8242ed6361a8a 100644
--- a/sky/sdk/lib/framework/rendering/flex.dart
+++ b/sky/sdk/lib/framework/rendering/flex.dart
@@ -39,6 +39,30 @@ class RenderFlex extends RenderBox with ContainerRenderObjectMixin<RenderBox, Fl
       child.parentData = new FlexBoxParentData();
   }
 
+  // We don't currently support this for RenderFlex
+  double getMinIntrinsicWidth(BoxConstraints constraints) {
+    assert(false);
+    return constraints.constrainWidth(0.0);
+  }
+
+  // We don't currently support this for RenderFlex
+  double getMaxIntrinsicWidth(BoxConstraints constraints) {
+    assert(false);
+    return constraints.constrainWidth(0.0);
+  }
+
+  // We don't currently support this for RenderFlex
+  double getMinIntrinsicHeight(BoxConstraints constraints) {
+    assert(false);
+    return constraints.constrainHeight(0.0);
+  }
+
+  // We don't currently support this for RenderFlex
+  double getMaxIntrinsicHeight(BoxConstraints constraints) {
+    assert(false);
+    return constraints.constrainHeight(0.0);
+  }
+
   bool get sizedByParent => true;
   void performResize() {
     size = constraints.constrain(new Size(constraints.maxWidth, constraints.maxHeight));