Add U2F request state machines

device/u2f/BUILD.gn

 # 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.
 
 import("//build/config/features.gni")
 import("//testing/libfuzzer/fuzzer_test.gni")
 
 source_set("u2f") {
   sources = [
     "u2f_apdu_command.cc",
     "u2f_apdu_command.h",
     "u2f_apdu_response.cc",
     "u2f_apdu_response.h",
     "u2f_device.cc",
     "u2f_device.h",
     "u2f_hid_device.cc",
     "u2f_hid_device.h",
     "u2f_message.cc",
     "u2f_message.h",
     "u2f_packet.cc",
     "u2f_packet.h",
+    "u2f_register.cc",
+    "u2f_register.h",
+    "u2f_request.cc",
+    "u2f_request.h",
+    "u2f_return_code.h",
+    "u2f_sign.cc",
+    "u2f_sign.h",
   ]
 
   deps = [
     "//base",
     "//crypto",
     "//device/base",
     "//device/hid",
     "//net",
   ]
 }
 
+source_set("mocks") {
+  testonly = true
+
+  sources = [
+    "mock_u2f_device.cc",
+    "mock_u2f_device.h",
+  ]
+
+  deps = [
+    ":u2f",
+    "//base",
+    "//testing/gmock",
+  ]
+}
+
 fuzzer_test("u2f_apdu_fuzzer") {
   sources = [
     "u2f_apdu_fuzzer.cc",
   ]
   deps = [
     ":u2f",
     "//net",
   ]
   libfuzzer_options = [ "max_len=65537" ]
 }
 
 fuzzer_test("u2f_message_fuzzer") {
   sources = [
     "u2f_message_fuzzer.cc",
   ]
   deps = [
     ":u2f",
     "//net",
   ]
   libfuzzer_options = [ "max_len=2048" ]
 }