Implement fromEnvironment on bool, int, String in dart2js.

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

Index: sdk/lib/_internal/compiler/implementation/compiler.dart
===================================================================
--- sdk/lib/_internal/compiler/implementation/compiler.dart	(revision 29652)
+++ sdk/lib/_internal/compiler/implementation/compiler.dart	(working copy)
@@ -473,7 +473,12 @@
   Element identicalFunction;
   Element functionApplyMethod;
   Element invokeOnMethod;
+  Element intEnvironment;
+  Element boolEnvironment;
+  Element stringEnvironment;
 
+  fromEnvironment(String name) => null;
+
   Element get currentElement => _currentElement;
 
   String tryToString(object) {
@@ -571,6 +576,8 @@
       Compiler.NO_SUCH_METHOD, null, Compiler.NO_SUCH_METHOD_ARG_COUNT);
   final Selector symbolValidatedConstructorSelector = new Selector.call(
       'validated', null, 1);
+  final Selector fromEnvironmentSelector = new Selector.callConstructor(
+      'fromEnvironment', null, 2);
 
   bool enabledNoSuchMethod = false;
   bool enabledRuntimeType = false;
@@ -852,6 +859,13 @@
           symbolValidatedConstructorSelector);
     } else if (mirrorsUsedClass == cls) {
       mirrorsUsedConstructor = cls.constructors.head;
+    } else if (intClass == cls) {
+      intEnvironment = intClass.lookupConstructor(fromEnvironmentSelector);
+    } else if (stringClass == cls) {
+      stringEnvironment =
+          stringClass.lookupConstructor(fromEnvironmentSelector);
+    } else if (boolClass == cls) {
+      boolEnvironment = boolClass.lookupConstructor(fromEnvironmentSelector);
     }
   }