Implement gfx::Transform StructTraits

ui/gfx/mojo/BUILD.gn

-# Copyright 2015 The Chromium Authors. All rights reserved.
+# 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.
 
-component("mojo") {
-  output_name = "mojo_transform_lib"
+import("//mojo/public/tools/bindings/mojom.gni")
 
-  public_deps = [
-    "//ui/gfx",
-  ]
-  deps = [
-    "//mojo/public/c/system:for_component",
-    "//skia",
-    "//ui/gfx/geometry/mojo",
-  ]
-
-  defines = [ "MOJO_TRANSFORM_IMPLEMENTATION" ]
-
+mojom("mojo") {
   sources = [
-    "mojo_transform_export.h",
-    "transform_type_converters.cc",
-    "transform_type_converters.h",
+    "transform.mojom",
   ]
 }