Nicer pretty printing of jsAst object literals.

sdk/lib/_internal/compiler/implementation/js/printer.dart

Index: sdk/lib/_internal/compiler/implementation/js/printer.dart
diff --git a/sdk/lib/_internal/compiler/implementation/js/printer.dart b/sdk/lib/_internal/compiler/implementation/js/printer.dart
index 1cf97a3e180362ebf70e2e757a800bb55d6bb95a..bc29bfedfde91fc776ff8e25195d3a2b21dbd281 100644
--- a/sdk/lib/_internal/compiler/implementation/js/printer.dart
+++ b/sdk/lib/_internal/compiler/implementation/js/printer.dart
@@ -802,25 +802,26 @@ class Printer implements NodeVisitor {
     // Print all the properties on one line until we see a function-valued
     // property.  Ideally, we would use a proper pretty-printer to make the
     // decision based on layout.
-    bool onePerLine = false;
     List<Property> properties = node.properties;
     out("{");
     ++indentLevel;
     for (int i = 0; i < properties.length; i++) {
       Expression value = properties[i].value;
-      if (value is Fun || value is NamedFunction) onePerLine = true;
       if (i != 0) {
         out(",");
-        if (!onePerLine) spaceOut();
+        if (node.isOneLiner) spaceOut();
       }
-      if (onePerLine) {
+      if (!node.isOneLiner) {
         forceLine();
         indent();
       }
       visitProperty(properties[i]);
     }
     --indentLevel;
-    if (onePerLine) lineOut();
+    if (!node.isOneLiner && !properties.isEmpty) {
+      lineOut();
+      indent();
+    }
     out("}");
   }