Improve type literals in minified mode.

dart/sdk/lib/_internal/lib/js_rti.dart

Index: dart/sdk/lib/_internal/lib/js_rti.dart
diff --git a/dart/sdk/lib/_internal/lib/js_rti.dart b/dart/sdk/lib/_internal/lib/js_rti.dart
index 4441214b8e9de4386f3a08042c4de780eca502f0..c32038296fa7fc46d845bb1c47ea97c2047c9e40 100644
--- a/dart/sdk/lib/_internal/lib/js_rti.dart
+++ b/dart/sdk/lib/_internal/lib/js_rti.dart
@@ -46,10 +46,17 @@ Type createRuntimeType(String name) => new TypeImpl(name);
 
 class TypeImpl implements Type {
   final String _typeName;
+  String _unmangledName;
 
   TypeImpl(this._typeName);
 
-  String toString() => _typeName;
+  String toString() {
+    if (_unmangledName != null) return _unmangledName;
+    String unmangledName = unmangleGlobalNameIfPreservedAnyways(_typeName);
+    // TODO(ahe): Handle type arguments.
+    if (unmangledName == null) unmangledName = _typeName;
+    return _unmangledName = unmangledName;
+  }
 
   // TODO(ahe): This is a poor hashCode as it collides with its name.
   int get hashCode => _typeName.hashCode;
@@ -59,6 +66,8 @@ class TypeImpl implements Type {
   }
 }
 
+getMangledTypeName(TypeImpl type) => type._typeName;
+
 /**
  * Sets the runtime type information on [target]. [typeInfo] is a type
  * representation of type 4 or 5, that is, either a JavaScript array or
@@ -677,9 +686,9 @@ bool isJsArray(var value) {
   return value is JSArray;
 }
 
-hasField(var object, var name) => JS('bool', r'#[#] != null', object, name);
+hasField(var object, var name) => JS('bool', r'# in #', name, object);
 
-hasNoField(var object, var name) => JS('bool', r'#[#] == null', object, name);
+hasNoField(var object, var name) => !hasField(object, name);
 
 /// Returns [:true:] if [o] is a JavaScript function.
 bool isJsFunction(var o) => JS('bool', r'typeof # == "function"', o);