dart2js cps: Fix codegen for foreign statements.

pkg/compiler/lib/src/tree_ir/tree_ir_tracer.dart

Index: pkg/compiler/lib/src/tree_ir/tree_ir_tracer.dart
diff --git a/pkg/compiler/lib/src/tree_ir/tree_ir_tracer.dart b/pkg/compiler/lib/src/tree_ir/tree_ir_tracer.dart
index ab4b5b0012eb0e6fa00e31c37e26d675c3b86303..caffb4a35406f8812e1b536444b8f7d4cc0bd580 100644
--- a/pkg/compiler/lib/src/tree_ir/tree_ir_tracer.dart
+++ b/pkg/compiler/lib/src/tree_ir/tree_ir_tracer.dart
@@ -328,7 +328,7 @@ class TreeTracer extends TracerUtil with StatementVisitor {
 
   @override
   visitForeignStatement(ForeignStatement node) {
-    printStatement(null, 'foreign');
+    printStatement(null, 'foreign ${node.codeTemplate.source}');
   }
 }
 
@@ -522,7 +522,7 @@ class SubexpressionVisitor extends ExpressionVisitor<String> {
   @override
   String visitForeignExpression(ForeignExpression node) {
     String arguments = node.arguments.map(visitExpression).join(', ');
-    return 'Foreign "${node.codeTemplate}"($arguments)';
+    return 'Foreign "${node.codeTemplate.source}"($arguments)';
   }
 
   @override