Change List constructors.

runtime/lib/array_patch.dart

Index: runtime/lib/array_patch.dart
diff --git a/runtime/lib/array_patch.dart b/runtime/lib/array_patch.dart
index 5bb7ec2c2ad176f5c4977b21ea7ea057bb63e02d..7000164774e1c12c8064b8d4de3b8366640d90b6 100644
--- a/runtime/lib/array_patch.dart
+++ b/runtime/lib/array_patch.dart
@@ -6,12 +6,43 @@
 // returns a _GrowableObjectArray if length is null, otherwise returns
 // fixed size array.
 patch class _ListImpl<E> {
-  /* patch */ factory List([int length = null]) {
-    if (length == null) {
-      return new _GrowableObjectArray<E>();
-    } else {
-      return new _ObjectArray<E>(length);
+  /* patch */ factory List([int length = 0]) {
+    if (length is! int || length < 0) {
+      throw new ArgumentError("Length must be a positive integer: $length.");
     }
+    _GrowableObjectArray<E> result = new _GrowableObjectArray<E>();
+    result.length = length;
+    return result;
+  }
+
+  /* patch */ factory List.fixedLength(int length, {E fill: null}) {
+    if (length is! int || length < 0) {
+      throw new ArgumentError("Length must be a positive integer: $length.");
+    }
+    _ObjectArray<E> result = new _ObjectArray<E>(length);
+    if (fill != null) {
+      for (int i = 0; i < length; i++) {
+        result[i] = fill;
+      }
+    }
+    return result;
+  }
+
+  /* patch */ factory List.filled(int length, E fill) {
+    if (length is! int || length < 0) {
+      throw new ArgumentError("Length must be a positive integer: $length.");
+    }
+    _GrowableObjectArray<E> result =
+        new _GrowableObjectArray<E>.withCapacity(length < 4 ? 4 : length);
+    if (length != 0) {
+      result.length = length;
+      if (fill != null) {
+        for (int i = 0; i < length; i++) {
+          result[i] = fill;
+        }
+      }
+    }
+    return result;
   }
 
   /* patch */ factory List.from(Iterable<E> other) {