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",
+    "//components/device_event_log",

[Reilly Grant (use Gerrit), 2016/11/23 22:21:50]

Unused.

[Casey Piper, 2016/11/29 22:11:15]

Acknowledged.

+    "//device/base",

[Reilly Grant (use Gerrit), 2016/11/23 22:21:50]

Unused.

[Casey Piper, 2016/11/29 22:11:15]

Acknowledged.

+    "//net",
+  ]
+}
+
+static_library("test_support") {

[Reilly Grant (use Gerrit), 2016/11/23 22:21:50]

Since you include u2f_message_unittest.cc in the device_unittests target above
you don't need this here.

+  testonly = true
+
+  sources = [
+    "u2f_message_unittest.cc",
+  ]
+
+  deps = [
+    ":u2f",
+    "//base",
+    "//net",
+    "//testing/gtest",
+  ]
+
+  public_deps = [
+    "//testing/gmock",
+  ]
+}