Add U2F request state machines

device/u2f/u2f_register.h

Index: device/u2f/u2f_register.h
diff --git a/device/u2f/u2f_register.h b/device/u2f/u2f_register.h
new file mode 100644
index 0000000000000000000000000000000000000000..8f6a3cfc364c04f438c4e54be1336f460c122033
--- /dev/null
+++ b/device/u2f/u2f_register.h
@@ -0,0 +1,37 @@
+// Copyright 2017 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.
+
+#ifndef DEVICE_U2F_U2F_REGISTER_H_
+#define DEVICE_U2F_U2F_REGISTER_H_
+
+#include <vector>
+
+#include "u2f_request.h"
+
+namespace device {
+
+class U2fRegister : public U2fRequest {
+ public:
+  U2fRegister(std::vector<uint8_t> challenge_hash,
+              std::vector<uint8_t> app_param,

[Reilly Grant (use Gerrit), 2017/04/21 17:19:16]

std::vector is usually passed as a const&. The reason we don't pass std::vector
by value is that it is too easy to forget to std::move it to avoid the copy, as
you've done here.

[Casey Piper, 2017/04/21 22:55:15]

Done.

+              const ResponseCallback& cb);
+  ~U2fRegister() override;
+
+  static std::unique_ptr<U2fRequest> TryRegistration(
+      std::vector<uint8_t> challenge_hash,
+      std::vector<uint8_t> app_param,
+      const ResponseCallback& cb);
+
+ private:
+  void TryDevice() override;
+  void OnTryDevice(U2fDevice::ReturnCode, std::vector<uint8_t>);
+
+  std::vector<uint8_t> challenge_hash_;
+  std::vector<uint8_t> app_param_;
+  base::WeakPtrFactory<U2fRegister> weak_factory_;
+};
+
+}  // namespace device
+
+#endif  // DEVICE_U2F_U2F_REGISTER_H_