Mojo: Simplify typemap usage.

mojo/public/cpp/bindings/tests/rect_chromium.typemap

Index: mojo/public/cpp/bindings/tests/rect_chromium.typemap
diff --git a/mojo/public/cpp/bindings/tests/rect_chromium.typemap b/mojo/public/cpp/bindings/tests/rect_chromium.typemap
new file mode 100644
index 0000000000000000000000000000000000000000..0da40211a4937ad71cd1584e46ef14eadfc2c7a5
--- /dev/null
+++ b/mojo/public/cpp/bindings/tests/rect_chromium.typemap
@@ -0,0 +1,9 @@
+# Copyright 2015 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+mojom = "//mojo/public/interfaces/bindings/tests/rect.mojom"
+public_headers = [ "//mojo/public/cpp/bindings/tests/rect_chromium.h" ]
+traits_headers = [ "//mojo/public/cpp/bindings/tests/rect_chromium_traits.h" ]
+
+type_mappings = [ "mojo.test.TypemappedRect=mojo::test::RectChromium" ]