Introduces the new syntax for deferred loading

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

Index: sdk/lib/_internal/compiler/implementation/tree/prettyprint.dart
diff --git a/sdk/lib/_internal/compiler/implementation/tree/prettyprint.dart b/sdk/lib/_internal/compiler/implementation/tree/prettyprint.dart
index 03c48e5052df4c06645191226d6649e00b964245..c7c1a328b893b4572040d202bc9e6586e4def40f 100644
--- a/sdk/lib/_internal/compiler/implementation/tree/prettyprint.dart
+++ b/sdk/lib/_internal/compiler/implementation/tree/prettyprint.dart
@@ -418,35 +418,53 @@ class PrettyPrinter implements Visitor {
     closeNode();
   }
 
-  visitNode(Node node) {
-    unimplemented('visitNode', node: node);
-  }
-
   visitCombinator(Combinator node) {
-    unimplemented('visitNode', node: node);
+    openNode(node, "Combinator", {"isShow" : "${node.isShow}",
+                                  "isHide" : "${node.isHide}"});
+    closeNode();
   }
 
   visitExport(Export node) {
-    unimplemented('visitNode', node: node);
+    openNode(node, "Export");
+    visitChildNode(node.uri, "uri");
+    visitChildNode(node.combinators, "combinators");
+    closeNode();
   }
 
-  visitExpression(Expression node) {
-    unimplemented('visitNode', node: node);
+  visitImport(Import node) {
+    openNode(node, "Import", {
+      "isDeferred" : "${node.isDeferred}"});
+    visitChildNode(node.uri, "uri");
+    visitChildNode(node.combinators, "combinators");
+    if (node.prefix != null) {
+      visitChildNode(node.prefix, "prefix");
+    }
+    closeNode();
   }
 
-  visitGotoStatement(GotoStatement node) {
-    unimplemented('visitNode', node: node);
+  visitPart(Part node) {
+    openNode(node, "Part");
+    visitChildNode(node.uri, "uri");
+    closeNode();
   }
 
-  visitImport(Import node) {
-    unimplemented('visitNode', node: node);
+  visitPartOf(PartOf node) {
+    openNode(node, "PartOf");
+    visitChildNode(node.name, "name");
+    closeNode();
   }
 
-  visitLibraryDependency(Node node) {
+  visitLibraryName(LibraryName node) {
+    openNode(node, "LibraryName");
+    visitChildNode(node.name, "name");
+    closeNode();
+  }
+
+  visitNode(Node node) {
     unimplemented('visitNode', node: node);
   }
 
-  visitLibraryName(LibraryName node) {
+  visitLibraryDependency(Node node) {
     unimplemented('visitNode', node: node);
   }
 
@@ -462,27 +480,27 @@ class PrettyPrinter implements Visitor {
     unimplemented('visitNode', node: node);
   }
 
-  visitPart(Part node) {
+  visitPostfix(Postfix node) {
     unimplemented('visitNode', node: node);
   }
 
-  visitPartOf(PartOf node) {
+  visitPrefix(Prefix node) {
     unimplemented('visitNode', node: node);
   }
 
-  visitPostfix(Postfix node) {
+  visitStringNode(StringNode node) {
     unimplemented('visitNode', node: node);
   }
 
-  visitPrefix(Prefix node) {
+  visitStatement(Statement node) {
     unimplemented('visitNode', node: node);
   }
 
-  visitStatement(Statement node) {
+  visitExpression(Expression node) {
     unimplemented('visitNode', node: node);
   }
 
-  visitStringNode(StringNode node) {
+  visitGotoStatement(GotoStatement node) {
     unimplemented('visitNode', node: node);
   }