Add FIDO U2F message and packet classes

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_message.cc",
+    "u2f_message.h",
+    "u2f_packet.cc",
+    "u2f_packet.h",
+  ]
+
+  deps = [
+    "//base",
+    "//net",
+  ]
+}
+
+fuzzer_test("u2f_message_fuzzer") {
+  sources = [
+    "u2f_message_fuzzer.cc",
+  ]
+  deps = [
+    ":u2f",
+  ]
+  libfuzzer_options = [ "max_len=65" ]

[Reilly Grant (use Gerrit), 2016/12/10 00:02:44]

Set this higher so you get continuation packets as this is what I'm most
interested in testing the parsing logic for.

[Casey Piper, 2016/12/10 01:38:03]

Since packets would be sent one at a time, I had to change the fuzzer test to
manually split up the packets. The constructor wouldn't split things up by
itself, but if there is a better way to do this, let me know.

+}