Redo how Type objects are exposed from DDC.

test/codegen/language/type_literal_test.dart

+// Copyright (c) 2016, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+import "package:expect/expect.dart";
+
+// TODO(rnystrom): This test has a lot of overlap with some other language
+// tests, but those are sort of all over the place so I thought it useful to
+// test all of the relevant bits in one place here.
+
+class Foo {}
+
+class Box<T> {
+  Type get typeArg => T;
+}
+
+typedef int Func(bool b);
+typedef int GenericFunc<T>(T t);
+
+main() {
+  // Primitive types.
+  testType(Object, "Object");
+  testType(Null, "Null");
+  testType(bool, "bool");
+  testType(double, "double");
+  testType(int, "int");
+  testType(num, "num");
+  testType(String, "String");
+
+  // Class types.
+  testType(Foo, "Foo");
+
+  // Generic classes.
+  testType(Box, "Box");
+  testType(new Box<Foo>().typeArg, "Foo");
+  testType(new Box<dynamic>().typeArg, "dynamic");
+  testType(new Box<Box<Foo>>().typeArg, "Box<Foo>");
+
+  // Typedef.
+  testType(Func, "Func");
+  testType(GenericFunc, "GenericFunc");
+
+  // TODO(rnystrom): This should print "GenericFunc<int>", but that isn't
+  // implemented yet.
+  testType(new Box<GenericFunc<int>>().typeArg, "GenericFunc");
+
+  // Literals are canonicalized.
+  Expect.identical(Foo, Foo);
+  Expect.identical(Box, Box);
+  Expect.identical(new Box<Foo>().typeArg, new Box<Foo>().typeArg);
+  Expect.identical(Func, Func);
+}