Add/remove surface references via MojoCompositorFrameSink.

cc/ipc/surface_reference.typemap

Index: cc/ipc/surface_reference.typemap
diff --git a/cc/ipc/surface_reference.typemap b/cc/ipc/surface_reference.typemap
new file mode 100644
index 0000000000000000000000000000000000000000..cb354907261e717047956bc24d20612acb7e1f11
--- /dev/null
+++ b/cc/ipc/surface_reference.typemap
@@ -0,0 +1,11 @@
+# Copyright 2016 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 = "//cc/ipc/surface_reference.mojom"
+public_headers = [ "//cc/surfaces/surface_reference.h" ]
+traits_headers = [ "//cc/ipc/surface_reference_struct_traits.h" ]
+deps = [
+  "//cc/ipc:struct_traits",
+]
+type_mappings = [ "cc.mojom.SurfaceReference=cc::SurfaceReference" ]