dart2js cps: Introduce GetStatic/SetStatic.

pkg/compiler/lib/src/dart_backend/backend_ast_emitter.dart

Index: pkg/compiler/lib/src/dart_backend/backend_ast_emitter.dart
diff --git a/pkg/compiler/lib/src/dart_backend/backend_ast_emitter.dart b/pkg/compiler/lib/src/dart_backend/backend_ast_emitter.dart
index 44f0ae919e798c5bf75da1617845e3eb60a440b2..6af3a4cb7d8c565501c0c9d633bbb0d3c4436e72 100644
--- a/pkg/compiler/lib/src/dart_backend/backend_ast_emitter.dart
+++ b/pkg/compiler/lib/src/dart_backend/backend_ast_emitter.dart
@@ -969,6 +969,21 @@ class ASTEmitter
   }
 
   @override
+  Expression visitGetStatic(tree.GetStatic node,
+                            BuilderContext<Statement> context) {
+    return new Identifier(node.element.name)..element = node.element;
+  }
+
+  @override
+  Expression visitSetStatic(tree.SetStatic node,
+                            BuilderContext<Statement> context) {
+    Expression target =
+        new Identifier(node.element.name)..element = node.element;
+    Expression value = visitExpression(node.value, context);
+    return makeAssignment(target, value);
+  }
+
+  @override
   Expression visitTypeExpression(tree.TypeExpression node, arg) {
     throw '$node not supported by dart backend';
   }