[CrOS Tether] Add FakeCryptAuthService, a test double for CryptAuthService.

components/cryptauth/BUILD.gn

 # Copyright 2014 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.
 
 # CryptAuth is a component which manages data about devices associated with a
 # user's account. This component both sends data about the current device and
 # requets data about associated devices.
 
 static_library("cryptauth") {
   sources = [
@@ skipping 84 matching lines @@
     "cryptauth_test_util.cc",
     "cryptauth_test_util.h",
     "device_to_device_responder_operations.cc",
     "device_to_device_responder_operations.h",
     "fake_authenticator.cc",
     "fake_authenticator.h",
     "fake_connection.cc",
     "fake_connection.h",
     "fake_cryptauth_gcm_manager.cc",
     "fake_cryptauth_gcm_manager.h",
+    "fake_cryptauth_service.cc",
+    "fake_cryptauth_service.h",
     "fake_secure_channel.cc",
     "fake_secure_channel.h",
     "fake_secure_context.cc",
     "fake_secure_context.h",
     "fake_secure_message_delegate.cc",
     "fake_secure_message_delegate.h",
     "mock_cryptauth_client.cc",
     "mock_cryptauth_client.h",
     "mock_eid_generator.cc",
     "mock_eid_generator.h",
@@ skipping 46 matching lines @@
     ":test_support",
     "//base/test:test_support",
     "//components/cryptauth/ble:unit_tests",
     "//components/gcm_driver:test_support",
     "//components/prefs:test_support",
     "//google_apis:test_support",
     "//net:test_support",
     "//testing/gtest",
   ]
 }