cps-ir: Support foreign code.

pkg/compiler/lib/src/js_backend/codegen/codegen.dart

Index: pkg/compiler/lib/src/js_backend/codegen/codegen.dart
diff --git a/pkg/compiler/lib/src/js_backend/codegen/codegen.dart b/pkg/compiler/lib/src/js_backend/codegen/codegen.dart
index 9a05a589e8227ad157530bf829e44da0241278ef..6e02f1d8a7d27bca93d0edd1dfd3b36720610d22 100644
--- a/pkg/compiler/lib/src/js_backend/codegen/codegen.dart
+++ b/pkg/compiler/lib/src/js_backend/codegen/codegen.dart
@@ -609,7 +609,7 @@ class CodeGenerator extends tree_ir.StatementVisitor
     js.Expression argumentNames = new js.ArrayInitializer(
         node.selector.namedArguments.map(js.string).toList(growable: false));
     return buildStaticHelperInvocation(glue.createInvocationMirrorMethod,
-        [name, internalName, kind, arguments, argumentNames]);
+        <js.Expression>[name, internalName, kind, arguments, argumentNames]);
   }
 
   @override
@@ -695,6 +695,21 @@ class CodeGenerator extends tree_ir.StatementVisitor
     return glue.generateTypeRepresentation(node.dartType, arguments);
   }
 
+  js.Node handleForeignCode(tree_ir.ForeignCode node) {
+    registry.registerStaticUse(node.dependency);
+    return node.codeTemplate.instantiate(visitExpressionList(node.arguments));
+  }
+
+  @override
+  js.Expression visitForeignExpression(tree_ir.ForeignExpression node) {
+    return handleForeignCode(node);
+  }
+
+  @override
+  visitForeignStatement(tree_ir.ForeignStatement node) {
+    return handleForeignCode(node);
+  }
+
   visitFunctionExpression(tree_ir.FunctionExpression node) {
     // FunctionExpressions are currently unused.
     // We might need them if we want to emit raw JS nested functions.