TaskScheduler: Add TaskRunnerHandle support to TaskScheduler tasks

base/task_scheduler/test_task_factory.cc

 // Copyright 2016 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 "base/task_scheduler/test_task_factory.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/location.h"
 #include "base/logging.h"
 #include "base/synchronization/waitable_event.h"
+#include "base/thread_task_runner_handle.h"
+#include "base/threading/sequenced_task_runner_handle.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace base {
 namespace internal {
 namespace test {
 
 TestTaskFactory::TestTaskFactory(scoped_refptr<TaskRunner> task_runner,
                                  ExecutionMode execution_mode)
     : cv_(&lock_),
       task_runner_(std::move(task_runner)),
@@ skipping 23 matching lines @@
 }
 
 void TestTaskFactory::RunTaskCallback(size_t task_index,
                                       PostNestedTask post_nested_task,
                                       WaitableEvent* event) {
   if (post_nested_task == PostNestedTask::YES)
     PostTask(PostNestedTask::NO, nullptr);
 
   EXPECT_TRUE(task_runner_->RunsTasksOnCurrentThread());
 
+  // Verify TaskRunnerHandles are set as expected in the task's scope.
+  switch (execution_mode_) {
+    case ExecutionMode::PARALLEL:
+      EXPECT_FALSE(ThreadTaskRunnerHandle::IsSet());
+      EXPECT_FALSE(SequencedTaskRunnerHandle::IsSet());
+      break;
+    case ExecutionMode::SEQUENCED:
+      EXPECT_FALSE(ThreadTaskRunnerHandle::IsSet());
+      EXPECT_TRUE(SequencedTaskRunnerHandle::IsSet());
+      EXPECT_EQ(task_runner_, SequencedTaskRunnerHandle::Get());
+      break;
+    case ExecutionMode::SINGLE_THREADED:
+      // SequencedTaskRunnerHandle inherits from ThreadTaskRunnerHandle so
+      // both are expected to be "set" in the SINGLE_THREADED case.
+      EXPECT_TRUE(ThreadTaskRunnerHandle::IsSet());
+      EXPECT_TRUE(SequencedTaskRunnerHandle::IsSet());
+      EXPECT_EQ(task_runner_, ThreadTaskRunnerHandle::Get());
+      EXPECT_EQ(task_runner_, SequencedTaskRunnerHandle::Get());
+      break;
+  }
+
   {
     AutoLock auto_lock(lock_);
 
     DCHECK_LE(task_index, num_posted_tasks_);
 
     if ((execution_mode_ == ExecutionMode::SINGLE_THREADED ||
          execution_mode_ == ExecutionMode::SEQUENCED) &&
         task_index != ran_tasks_.size()) {
       ADD_FAILURE() << "A task didn't run in the expected order.";
     }
 
     if (execution_mode_ == ExecutionMode::SINGLE_THREADED)
       EXPECT_TRUE(thread_checker_.CalledOnValidThread());
 
     if (ran_tasks_.find(task_index) != ran_tasks_.end())
       ADD_FAILURE() << "A task ran more than once.";
     ran_tasks_.insert(task_index);
 
     cv_.Signal();
   }
 
   if (event)
     event->Wait();
 }
 
 }  // namespace test
 }  // namespace internal
 }  // namespace base