Split getIntrinsicDimensions into four pieces

sky/examples/lib/solid_color_box.dart

Index: sky/examples/lib/solid_color_box.dart
diff --git a/sky/examples/lib/solid_color_box.dart b/sky/examples/lib/solid_color_box.dart
index 4608f4b6b334d766e8f026c92fa315e946ca7dc0..219366fd96679052df0209a023b14d8a338f51f0 100644
--- a/sky/examples/lib/solid_color_box.dart
+++ b/sky/examples/lib/solid_color_box.dart
@@ -13,8 +13,20 @@ class RenderSolidColorBox extends RenderDecoratedBox {
       : backgroundColor = backgroundColor,
         super(decoration: new BoxDecoration(backgroundColor: backgroundColor));
 
-  Size getIntrinsicDimensions(BoxConstraints constraints) {
-    return constraints.constrain(desiredSize);
+  double getMinIntrinsicWidth(BoxConstraints constraints) {
+    return constraints.constrainWidth(desiredSize.width);
+  }
+
+  double getMaxIntrinsicWidth(BoxConstraints constraints) {
+    return constraints.constrainWidth(desiredSize.width);
+  }
+
+  double getMinIntrinsicHeight(BoxConstraints constraints) {
+    return constraints.constrainHeight(desiredSize.height);
+  }
+
+  double getMaxIntrinsicHeight(BoxConstraints constraints) {
+    return constraints.constrainHeight(desiredSize.height);
   }
 
   void performLayout() {