Adding the AccessTokenFetcher and Environment class to the app remoting test

remoting/test/fake_access_token_fetcher.h

+// 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.
+
+#ifndef REMOTING_TEST_FAKE_ACCESS_TOKEN_FETCHER_H_
+#define REMOTING_TEST_FAKE_ACCESS_TOKEN_FETCHER_H_
+
+#include "remoting/test/access_token_fetcher.h"
+
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace remoting {
+namespace test {
+
+const char kFakeAccessTokenFetcherRefreshTokenValue[] = "fake_refresh_token";
+const char kFakeAccessTokenFetcherAccessTokenValue[] = "fake_access_token";
+
+// Used for testing classes which rely on the AccessTokenFetcher and want to
+// simulate success and failure scenarios without using the actual class and
+// network connection.
+class FakeAccessTokenFetcher : public AccessTokenFetcher {
+ public:
+  FakeAccessTokenFetcher();
+  ~FakeAccessTokenFetcher() override;
+
+  // AccessTokenFetcher interface.
+  void GetAccessTokenFromAuthCode(
+    const std::string& auth_code,
+    const AccessTokenCallback& callback) override;
+  void GetAccessTokenFromRefreshToken(
+      const std::string& refresh_token,
+      const AccessTokenCallback& callback) override;
+
+  void set_fail_access_token_from_auth_code(bool fail) {
+    fail_access_token_from_auth_code_ = fail;
+  }
+
+  void set_fail_access_token_from_refresh_token(bool fail) {
+    fail_access_token_from_refresh_token_ = fail;
+  }
+
+ private:
+  // True if GetAccessTokenFromAuthCode() should fail.
+  bool fail_access_token_from_auth_code_;
+
+  // True if GetAccessTokenFromRefreshToken() should fail.
+  bool fail_access_token_from_refresh_token_;
+
+  DISALLOW_COPY_AND_ASSIGN(FakeAccessTokenFetcher);
+};
+
+}  // namespace test
+}  // namespace remoting
+
+#endif  // REMOTING_TEST_FAKE_ACCESS_TOKEN_FETCHER_H_