Adding the AccessTokenFetcher and Environment class to the app remoting test

remoting/test/fake_access_token_fetcher.cc

+// Copyright 2015 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.
+
+#include "remoting/test/fake_access_token_fetcher.h"
+
+namespace remoting {
+namespace test {
+
+FakeAccessTokenFetcher::FakeAccessTokenFetcher() :
+    fail_access_token_from_auth_code_(false),
+    fail_access_token_from_refresh_token_(false) {}
+
+FakeAccessTokenFetcher::~FakeAccessTokenFetcher() {}
+
+
+void FakeAccessTokenFetcher::GetAccessTokenFromAuthCode(
+    const std::string& auth_code,
+    const AccessTokenCallback& callback) {
+  if (fail_access_token_from_auth_code_) {
+    // Empty strings are returned in failure cases.
+    callback.Run(std::string(), std::string());
+  } else {
+    callback.Run(kFakeAccessTokenFetcherAccessTokenValue,
+                 kFakeAccessTokenFetcherRefreshTokenValue);
+  }
+}
+
+void FakeAccessTokenFetcher::GetAccessTokenFromRefreshToken(
+    const std::string& refresh_token,
+    const AccessTokenCallback& callback) {
+  if (fail_access_token_from_refresh_token_) {
+    // Empty strings are returned in failure cases.
+    callback.Run(std::string(), std::string());
+  } else {
+    callback.Run(kFakeAccessTokenFetcherAccessTokenValue,
+                 kFakeAccessTokenFetcherRefreshTokenValue);
+  }
+}
+
+}  // namespace test
+}  // namespace remoting