Implement fromEnvironment on bool, int, String in dart2js.

sdk/lib/_internal/lib/core_patch.dart

Index: sdk/lib/_internal/lib/core_patch.dart
===================================================================
--- sdk/lib/_internal/lib/core_patch.dart	(revision 29517)
+++ sdk/lib/_internal/lib/core_patch.dart	(working copy)
@@ -102,6 +102,11 @@
                            int onError(String source) }) {
     return Primitives.parseInt(source, radix, onError);
   }
+
+  patch factory int.fromEnvironment(String name, {int defaultValue}) {
+    throw new UnsupportedError(
+        'int.fromEnvironement can only be used as a const constructor');
+  }
 }
 
 patch class double {
@@ -219,8 +224,20 @@
     }
     return Primitives.stringFromCharCodes(charCodes);
   }
+
+  patch factory String.fromEnvironment(String name, {String defaultValue}) {
+    throw new UnsupportedError(
+        'String.fromEnvironement can only be used as a const constructor');
+  }
 }
 
+patch class bool {
+  patch factory bool.fromEnvironment(String name) {
+    throw new UnsupportedError(
+        'bool.fromEnvironement can only be used as a const constructor');
+  }
+}
+
 patch class RegExp {
   patch factory RegExp(String source,
                        {bool multiLine: false,