Backport some tests in /fuchsia to SingleThreadTaskEnvironment

These tests were previously migrated from single-threaded MessageLoop to
a multi-threaded TaskEnvironment (then named ScopedTaskEnvironment) as
part of crbug.com/891670.

//base OWNERS decided in retrospect that it was better to keep a
single-threaded option for TaskEnvironment and introduced
SingleThreadTaskEnvironment. This CL retrofits that decision for
/fuchsia.

This CL is a no-op if it passes CQ.

This CL was uploaded by git cl split.

R=wez@chromium.org

Bug: 891670
Change-Id: Ie88dc27610fefddf8ed30f392f4b7747573cb52b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1787104
Commit-Queue: Gabriel Charette <gab@chromium.org>
Auto-Submit: Gabriel Charette <gab@chromium.org>
Reviewed-by: Wez <wez@chromium.org>
Cr-Commit-Position: refs/heads/master@{#694554}

fuchsia/base/agent_impl_unittests.cc

@@ -100,9 +100,8 @@ class AgentImplTest : public ::testing::Test {
     return nullptr;
   }
 
-  base::test::TaskEnvironment task_environment_{
-      base::test::TaskEnvironment::ThreadingMode::MAIN_THREAD_ONLY,
-      base::test::TaskEnvironment::MainThreadType::IO};
+  base::test::SingleThreadTaskEnvironment task_environment_{
+      base::test::SingleThreadTaskEnvironment::MainThreadType::IO};
   sys::OutgoingDirectory services_;
   std::unique_ptr<base::fuchsia::ServiceDirectoryClient> services_client_;
 

fuchsia/engine/context_provider_impl_unittest.cc

@@ -46,9 +46,8 @@ constexpr char kUrl[] = "chrome://:emorhc";
 constexpr char kTitle[] = "Palindrome";
 
 MULTIPROCESS_TEST_MAIN(SpawnContextServer) {
-  base::test::TaskEnvironment task_environment(
-      base::test::TaskEnvironment::ThreadingMode::MAIN_THREAD_ONLY,
-      base::test::TaskEnvironment::MainThreadType::IO);
+  base::test::SingleThreadTaskEnvironment task_environment(
+      base::test::SingleThreadTaskEnvironment::MainThreadType::IO);
 
   base::FilePath data_dir;
   CHECK(base::PathService::Get(base::DIR_APP_DATA, &data_dir));
@@ -179,9 +178,8 @@ class ContextProviderImplTest : public base::MultiProcessTest {
   }
 
  protected:
-  base::test::TaskEnvironment task_environment_{
-      base::test::TaskEnvironment::ThreadingMode::MAIN_THREAD_ONLY,
-      base::test::TaskEnvironment::MainThreadType::IO};
+  base::test::SingleThreadTaskEnvironment task_environment_{
+      base::test::SingleThreadTaskEnvironment::MainThreadType::IO};
   std::unique_ptr<ContextProviderImpl> provider_;
   fuchsia::web::ContextProviderPtr provider_ptr_;
   fidl::BindingSet<fuchsia::web::ContextProvider> bindings_;

fuchsia/engine/web_engine_debug_integration_test.cc

@@ -96,9 +96,8 @@ class WebEngineDebugIntegrationTest : public testing::Test {
               fuchsia::web::ContextError::REMOTE_DEBUGGING_PORT_NOT_OPENED);
   }
 
-  base::test::TaskEnvironment task_environment_{
-      base::test::TaskEnvironment::ThreadingMode::MAIN_THREAD_ONLY,
-      base::test::TaskEnvironment::MainThreadType::IO};
+  base::test::SingleThreadTaskEnvironment task_environment_{
+      base::test::SingleThreadTaskEnvironment::MainThreadType::IO};
 
   TestDebugListener dev_tools_listener_;
   fidl::Binding<fuchsia::web::DevToolsListener> dev_tools_listener_binding_;

fuchsia/runners/cast/cast_runner_integration_test.cc

@@ -250,9 +250,8 @@ class CastRunnerIntegrationTest : public testing::Test {
   }
 
   const base::RunLoop::ScopedRunTimeoutForTest run_timeout_;
-  base::test::TaskEnvironment task_environment_{
-      base::test::TaskEnvironment::ThreadingMode::MAIN_THREAD_ONLY,
-      base::test::TaskEnvironment::MainThreadType::IO};
+  base::test::SingleThreadTaskEnvironment task_environment_{
+      base::test::SingleThreadTaskEnvironment::MainThreadType::IO};
   net::EmbeddedTestServer test_server_;
 
   // Returns fake Cast application information to the CastRunner.

fuchsia/runners/web/web_runner_smoke_test.cc

@@ -87,9 +87,8 @@ class WebRunnerSmokeTest : public testing::Test {
   bool test_html_requested_ = false;
   bool test_image_requested_ = false;
 
-  base::test::TaskEnvironment task_environment_{
-      base::test::TaskEnvironment::ThreadingMode::MAIN_THREAD_ONLY,
-      base::test::TaskEnvironment::MainThreadType::IO};
+  base::test::SingleThreadTaskEnvironment task_environment_{
+      base::test::SingleThreadTaskEnvironment::MainThreadType::IO};
 
   sys::OutgoingDirectory outgoing_directory_;
   std::unique_ptr<base::fuchsia::ServiceProviderImpl> service_provider_;