47   scoped_refptr<Sequence> sequence = MakeRefCounted<Sequence>();  in TEST()  local
51   EXPECT_TRUE(sequence->PushTask(CreateTask(&mock_task_a)));  in TEST()
55   EXPECT_FALSE(sequence->PushTask(CreateTask(&mock_task_b)));  in TEST()
56   EXPECT_FALSE(sequence->PushTask(CreateTask(&mock_task_c)));  in TEST()
57   EXPECT_FALSE(sequence->PushTask(CreateTask(&mock_task_d)));  in TEST()
60   Optional<Task> task = sequence->TakeTask();  in TEST()
65   EXPECT_FALSE(sequence->Pop());  in TEST()
66   task = sequence->TakeTask();  in TEST()
71   EXPECT_FALSE(sequence->Pop());  in TEST()
72   task = sequence->TakeTask();  in TEST()
77   EXPECT_FALSE(sequence->Pop());  in TEST()
80   EXPECT_FALSE(sequence->PushTask(CreateTask(&mock_task_e)));  in TEST()
83   task = sequence->TakeTask();  in TEST()
88   EXPECT_FALSE(sequence->Pop());  in TEST()
89   task = sequence->TakeTask();  in TEST()
94   EXPECT_TRUE(sequence->Pop());  in TEST()
149   scoped_refptr<Sequence> sequence = MakeRefCounted<Sequence>();  in TEST()  local
150   sequence->PushTask(Task(FROM_HERE, DoNothing(), TaskTraits(), TimeDelta()));  in TEST()
152   EXPECT_DCHECK_DEATH({ sequence->Pop(); });  in TEST()
158   scoped_refptr<Sequence> sequence = MakeRefCounted<Sequence>();  in TEST()  local
159   sequence->PushTask(Task(FROM_HERE, DoNothing(), TaskTraits(), TimeDelta()));  in TEST()
161   EXPECT_TRUE(sequence->TakeTask());  in TEST()
162   EXPECT_DCHECK_DEATH({ sequence->TakeTask(); });  in TEST()
167   scoped_refptr<Sequence> sequence = MakeRefCounted<Sequence>();  in TEST()  local
168   EXPECT_DCHECK_DEATH({ sequence->TakeTask(); });  in TEST()