Add U2F request state machines

device/BUILD.gn

Index: device/BUILD.gn
diff --git a/device/BUILD.gn b/device/BUILD.gn
index eba54e219c1c4a165fc80254f89ff978769f8cc2..19ff0406903665e36a15b0f4cf7a88b62ae77d28 100644
--- a/device/BUILD.gn
+++ b/device/BUILD.gn
@@ -135,12 +135,17 @@ test("device_unittests") {
       "hid/test_report_descriptors.h",
       "serial/serial_io_handler_posix_unittest.cc",
       "u2f/u2f_hid_device_unittest.cc",
+      "u2f/u2f_register_unittest.cc",
+      "u2f/u2f_request_unittest.cc",
+      "u2f/u2f_sign_unittest.cc",
     ]
     deps += [
       "//device/hid",
       "//device/hid:mocks",
       "//device/serial",
       "//device/serial:test_support",
+      "//device/u2f",
+      "//device/u2f:mocks",
     ]
   }
 
@@ -170,7 +175,6 @@ test("device_unittests") {
     deps += [
       "//device/base",
       "//device/base:mocks",
-      "//device/u2f",
       "//device/usb",
       "//device/usb:test_support",
       "//device/usb/mojo",