Mojo bindings: Fix typemap includes.

mojo/public/interfaces/bindings/tests/chromium_test.typemap

Index: mojo/public/interfaces/bindings/tests/chromium_test.typemap
diff --git a/mojo/public/interfaces/bindings/tests/chromium_test.typemap b/mojo/public/interfaces/bindings/tests/chromium_test.typemap
index 260826e46b438d34e44acff0fb3958937fe7ab5f..57474b12305f2c4e4e2ffb6b7be027a1541c3cc7 100644
--- a/mojo/public/interfaces/bindings/tests/chromium_test.typemap
+++ b/mojo/public/interfaces/bindings/tests/chromium_test.typemap
@@ -6,15 +6,18 @@
   "c++": {
     "mojo.test.PickledStruct": {
       "typename": "mojo::test::PickledStructChromium",
-      "headers": [
+      "public_headers": [
         "mojo/public/cpp/bindings/tests/pickled_struct_chromium.h"
       ]
+    },
+    "mojo.test.TypemappedRect": {
+      "typename": "mojo::test::RectChromium",
+      "public_headers": [
+        "mojo/public/cpp/bindings/tests/rect_chromium.h"
+      ],
+      "traits_headers": [
+        "mojo/public/cpp/bindings/tests/rect_chromium_traits.h"
+      ]
     }
-//  "mojo.test.Rect": {
-//    "typename": "mojo::test::RectChromium",
-//    "headers": [
-//      "mojo/public/cpp/bindings/tests/rect_chromium.h"
-//    ]
-//  }
   }
 }