Random cleanup of various Dart things in our tree.

sky/sdk/lib/rendering/box.dart

Index: sky/sdk/lib/rendering/box.dart
diff --git a/sky/sdk/lib/rendering/box.dart b/sky/sdk/lib/rendering/box.dart
index 36a3e12f94c49b7a576c1bcaa500619786435d06..f6de4f4e61b2d15e7ffe112e9b3e8e9695d5a476 100644
--- a/sky/sdk/lib/rendering/box.dart
+++ b/sky/sdk/lib/rendering/box.dart
@@ -321,7 +321,10 @@ abstract class RenderBox extends RenderObject {
     assert(constraints != null);
     assert(_size != null);
     assert(!_size.isInfinite);
-    return constraints.contains(_size);
+    bool result = constraints.contains(_size);
+    if (!result)
+      print("${this.runtimeType} does not meet its constraints. Constraints: $constraints, size: $_size");
+    return result;
   }
   void performResize() {
     // default behaviour for subclasses that have sizedByParent = true
@@ -763,17 +766,21 @@ class RenderPadding extends RenderShiftedBox {
 
   void performLayout() {
     assert(padding != null);
-    BoxConstraints innerConstraints = constraints.deflate(padding);
     if (child == null) {
-      size = innerConstraints.constrain(
-          new Size(padding.left + padding.right, padding.top + padding.bottom));
+      size = constraints.constrain(new Size(
+        padding.left + padding.right,
+        padding.top + padding.bottom
+      ));
       return;
     }
+    BoxConstraints innerConstraints = constraints.deflate(padding);
     child.layout(innerConstraints, parentUsesSize: true);
     assert(child.parentData is BoxParentData);
     child.parentData.position = new Point(padding.left, padding.top);
-    size = constraints.constrain(new Size(padding.left + child.size.width + padding.right,
-                                              padding.top + child.size.height + padding.bottom));
+    size = constraints.constrain(new Size(
+      padding.left + child.size.width + padding.right,
+      padding.top + child.size.height + padding.bottom
+    ));
   }
 
   String debugDescribeSettings(String prefix) => '${super.debugDescribeSettings(prefix)}${prefix}padding: ${padding}\n';
@@ -1154,6 +1161,10 @@ class RenderView extends RenderObject with RenderObjectWithChildMixin<RenderBox>
     markNeedsLayout();
   }
 
+  // We never call layout() on this class, so this should never get
+  // checked. (This class is laid out using scheduleInitialLayout().)
+  bool debugDoesMeetConstraints() { assert(false); return false; }
+
   void performResize() {
     assert(false);
   }