[Autofill] Add typemap for autofill:FormFieldData and autofill::FormData.

components/autofill/content/public/cpp/BUILD.gn

Index: components/autofill/content/public/cpp/BUILD.gn
diff --git a/components/password_manager/content/public/cpp/BUILD.gn b/components/autofill/content/public/cpp/BUILD.gn
similarity index 59%
copy from components/password_manager/content/public/cpp/BUILD.gn
copy to components/autofill/content/public/cpp/BUILD.gn
index 3b22d006306cf6028151b214e78731f872479dca..e7c88ce2faf666abd09bccbacbb76b2991795b4b 100644
--- a/components/password_manager/content/public/cpp/BUILD.gn
+++ b/components/autofill/content/public/cpp/BUILD.gn
@@ -2,22 +2,21 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
-source_set("cpp") {
+source_set("unit_tests") {
+  testonly = true
   sources = [
-    "type_converters.cc",
-    "type_converters.h",
+    "autofill_types_struct_traits_unittest.cc",
   ]
 
   public_deps = [
-    "../interfaces",
+    "../interfaces:test_types",
   ]
 
   deps = [
     "//base",
+    "//components/autofill/core/browser:test_support",
     "//components/password_manager/core/common",
-    "//mojo/common:common_base",
-    "//mojo/common:url_type_converters",
     "//mojo/public/cpp/bindings",
-    "//third_party/WebKit/public:blink_headers",
+    "//testing/gtest",
   ]
 }