Make html lists print a nice toString method.

sdk/lib/svg/dart2js/svg_dart2js.dart

Index: sdk/lib/svg/dart2js/svg_dart2js.dart
diff --git a/sdk/lib/svg/dart2js/svg_dart2js.dart b/sdk/lib/svg/dart2js/svg_dart2js.dart
index feeb7450b8e4e646f196b0a9e94345de7f91365e..46ee3bc1091556b73a0eb8c2d54b624ee9df627a 100644
--- a/sdk/lib/svg/dart2js/svg_dart2js.dart
+++ b/sdk/lib/svg/dart2js/svg_dart2js.dart
@@ -3242,6 +3242,13 @@ class LengthList implements JavaScriptIndexingBehavior, List<Length> native "*SV
   Map<int, Length> asMap() =>
     IterableMixinWorkaround.asMapList(this);
 
+  String toString() {
+    StringBuffer buffer = new StringBuffer('[');
+    buffer.writeAll(this, ', ');
+    buffer.write(']');
+    return buffer.toString();
+  }
+
   // -- end List<Length> mixins.
 
   @DomName('SVGLengthList.appendItem')
@@ -3880,6 +3887,13 @@ class NumberList implements JavaScriptIndexingBehavior, List<Number> native "*SV
   Map<int, Number> asMap() =>
     IterableMixinWorkaround.asMapList(this);
 
+  String toString() {
+    StringBuffer buffer = new StringBuffer('[');
+    buffer.writeAll(this, ', ');
+    buffer.write(']');
+    return buffer.toString();
+  }
+
   // -- end List<Number> mixins.
 
   @DomName('SVGNumberList.appendItem')
@@ -4794,6 +4808,13 @@ class PathSegList implements JavaScriptIndexingBehavior, List<PathSeg> native "*
   Map<int, PathSeg> asMap() =>
     IterableMixinWorkaround.asMapList(this);
 
+  String toString() {
+    StringBuffer buffer = new StringBuffer('[');
+    buffer.writeAll(this, ', ');
+    buffer.write(']');
+    return buffer.toString();
+  }
+
   // -- end List<PathSeg> mixins.
 
   @DomName('SVGPathSegList.appendItem')
@@ -5693,6 +5714,13 @@ class StringList implements JavaScriptIndexingBehavior, List<String> native "*SV
   Map<int, String> asMap() =>
     IterableMixinWorkaround.asMapList(this);
 
+  String toString() {
+    StringBuffer buffer = new StringBuffer('[');
+    buffer.writeAll(this, ', ');
+    buffer.write(']');
+    return buffer.toString();
+  }
+
   // -- end List<String> mixins.
 
   @DomName('SVGStringList.appendItem')
@@ -6869,6 +6897,13 @@ class TransformList implements List<Transform>, JavaScriptIndexingBehavior nativ
   Map<int, Transform> asMap() =>
     IterableMixinWorkaround.asMapList(this);
 
+  String toString() {
+    StringBuffer buffer = new StringBuffer('[');
+    buffer.writeAll(this, ', ');
+    buffer.write(']');
+    return buffer.toString();
+  }
+
   // -- end List<Transform> mixins.
 
   @DomName('SVGTransformList.appendItem')
@@ -7402,6 +7437,13 @@ class _ElementInstanceList implements JavaScriptIndexingBehavior, List<ElementIn
   Map<int, ElementInstance> asMap() =>
     IterableMixinWorkaround.asMapList(this);
 
+  String toString() {
+    StringBuffer buffer = new StringBuffer('[');
+    buffer.writeAll(this, ', ');
+    buffer.write(']');
+    return buffer.toString();
+  }
+
   // -- end List<ElementInstance> mixins.
 
   @DomName('SVGElementInstanceList.item')