Implement gfx::Transform StructTraits unit test

ui/gfx/BUILD.gn

Index: ui/gfx/BUILD.gn
diff --git a/ui/gfx/BUILD.gn b/ui/gfx/BUILD.gn
index d170f32c5e0b5081ed6ecc3619f11c6ee9640932..88d732163d15ef99fe1bc5b32ce5f57738f3faa4 100644
--- a/ui/gfx/BUILD.gn
+++ b/ui/gfx/BUILD.gn
@@ -725,6 +725,7 @@ test("gfx_unittests") {
       "image/image_mac_unittest.mm",
       "image/image_util_unittest.cc",
       "mac/coordinate_conversion_unittest.mm",
+      "mojo/struct_traits_unittest.cc",
       "nine_image_painter_unittest.cc",
       "path_mac_unittest.mm",
       "platform_font_mac_unittest.mm",
@@ -808,6 +809,14 @@ test("gfx_unittests") {
       "oleacc.lib",
     ]
   }
+
+  if (!is_ios) {
+    deps += [
+      "mojo:test_interfaces",
+      "//mojo/edk/system",
+      "//mojo/public/cpp/bindings",
+    ]
+  }
 }
 
 if (is_android) {