Support base::test::ScopedTaskEnvironment and content::TestBrowserThreadBundle in the same scope.

content/public/test/test_browser_thread_bundle_unittest.cc

+// Copyright 2017 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 "content/public/test/test_browser_thread_bundle.h"
+
+#include "base/message_loop/message_loop.h"
+#include "base/test/scoped_task_environment.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace content {
+
+TEST(TestBrowserThreadBundle, ScopedTaskEnvironmentAndTestBrowserThreadBundle) {
+  base::test::ScopedTaskEnvironment scoped_task_environment(
+      base::test::ScopedTaskEnvironment::MainThreadType::UI);
+  TestBrowserThreadBundle test_browser_thread_bundle;
+}
+
+TEST(TestBrowserThreadBundleTest, MessageLoopTypeMismatch) {
+  base::MessageLoopForUI message_loop;
+  EXPECT_DEATH(
+      {
+        TestBrowserThreadBundle test_browser_thread_bundle(
+            TestBrowserThreadBundle::IO_MAINLOOP);
+      },
+      "");
+}
+
+TEST(TestBrowserThreadBundleTest, MultipleTestBrowserThreadBundle) {
+  TestBrowserThreadBundle test_browser_thread_bundle;
+  EXPECT_DEATH({ TestBrowserThreadBundle other_test_browser_thread_bundle; },
+               "");
+}
+
+}  // namespace content