Mojo: add native type mapping for base::FilePath

mojo/common/BUILD.gn

 # Copyright 2014 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.
 
+import("//mojo/public/tools/bindings/mojom.gni")
 import("//testing/test.gni")
 
 group("common") {
   public_deps = [
     ":common_base",
+    ":common_custom_types",
     ":url_type_converters",
   ]
 }
 
+# GYP version: mojo/mojo_base.gyp:mojo_common_custom_types
+mojom("common_custom_types") {
+  sources = [
+    "common_custom_types.mojom",
+  ]
+}
+
 # GYP version: mojo/mojo_base.gyp:mojo_common_lib
 component("common_base") {
   output_name = "mojo_common_lib"
 
   sources = [
     "common_type_converters.cc",
     "common_type_converters.h",
     "data_pipe_drainer.cc",
     "data_pipe_drainer.h",
     "data_pipe_file_utils.cc",
@@ skipping 27 matching lines @@
 
   deps = [
     ":common_base",
     "//base",
     "//base/third_party/dynamic_annotations",
     "//mojo/public/cpp/bindings",
     "//url",
   ]
 }
 
+# GYP version: mojo/mojo_base.gyp:mojo_test_common_custom_types
+mojom("test_common_custom_types") {
+  sources = [
+    "test_common_custom_types.mojom",
+  ]
+  public_deps = [
+    ":common_custom_types",
+  ]
+}
+
 # GYP version: mojo/mojo_base.gyp:mojo_common_unittests
 test("mojo_common_unittests") {
   deps = [
     ":common",
+    ":common_custom_types",
+    ":test_common_custom_types",
     "//base",
     "//base:message_loop_tests",
     "//base/test:test_support",
     "//mojo/edk/test:run_all_unittests",
     "//mojo/edk/test:test_support",
     "//mojo/message_pump",
     "//mojo/public/cpp/bindings",
     "//mojo/public/cpp/test_support:test_utils",
     "//testing/gtest",
     "//url",
   ]
 
   sources = [
     # The message_pump tests are so small and some what related to this code
     # that we put them here.
     "../message_pump/handle_watcher_unittest.cc",
     "../message_pump/message_pump_mojo_unittest.cc",
+    "common_custom_types_unittest.cc",
     "common_type_converters_unittest.cc",
   ]
 
   if (is_linux && !is_component_build) {
     # This tests dynamically loads libmojo_test_support even in non-component
     # builds.
     configs += [ "//build/config/gcc:rpath_for_built_shared_libraries" ]
   }
 }
 
@@ skipping 10 matching lines @@
   sources = [
     "../message_pump/handle_watcher_perftest.cc",
   ]
 
   if (is_linux && !is_component_build) {
     # This test dynamically loads libmojo_test_support even in non-component
     # builds.
     configs += [ "//build/config/gcc:rpath_for_built_shared_libraries" ]
   }
 }