TaskScheduler: Avoid Sequence refcount bump in GetWork()

base/task_scheduler/sequence_sort_key_unittest.cc

Index: base/task_scheduler/sequence_sort_key_unittest.cc
diff --git a/base/task_scheduler/sequence_sort_key_unittest.cc b/base/task_scheduler/sequence_sort_key_unittest.cc
index 5c6c917294b83fd27cc3b2bd32b8ab6c148a1822..2c1d80da74c96a726a783ef9885c7a2955efdd60 100644
--- a/base/task_scheduler/sequence_sort_key_unittest.cc
+++ b/base/task_scheduler/sequence_sort_key_unittest.cc
@@ -125,5 +125,119 @@ TEST(TaskSchedulerSequenceSortKeyTest, OperatorGreaterThan) {
   EXPECT_FALSE(key_f > key_f);
 }
 
+TEST(TaskSchedulerSequenceSortKeyTest, OperatorEqual) {
+  SequenceSortKey key_a(TaskPriority::USER_BLOCKING,
+                        TimeTicks::FromInternalValue(1000));
+  SequenceSortKey key_b(TaskPriority::USER_BLOCKING,
+                        TimeTicks::FromInternalValue(2000));
+  SequenceSortKey key_c(TaskPriority::USER_VISIBLE,
+                        TimeTicks::FromInternalValue(1000));
+  SequenceSortKey key_d(TaskPriority::USER_VISIBLE,
+                        TimeTicks::FromInternalValue(2000));
+  SequenceSortKey key_e(TaskPriority::BACKGROUND,
+                        TimeTicks::FromInternalValue(1000));
+  SequenceSortKey key_f(TaskPriority::BACKGROUND,
+                        TimeTicks::FromInternalValue(2000));
+
+  EXPECT_EQ(key_a, key_a);
+  EXPECT_FALSE(key_b == key_a);
+  EXPECT_FALSE(key_c == key_a);
+  EXPECT_FALSE(key_d == key_a);
+  EXPECT_FALSE(key_e == key_a);
+  EXPECT_FALSE(key_f == key_a);
+
+  EXPECT_FALSE(key_a == key_b);
+  EXPECT_EQ(key_b, key_b);
+  EXPECT_FALSE(key_c == key_b);
+  EXPECT_FALSE(key_d == key_b);
+  EXPECT_FALSE(key_e == key_b);
+  EXPECT_FALSE(key_f == key_b);
+
+  EXPECT_FALSE(key_a == key_c);
+  EXPECT_FALSE(key_b == key_c);
+  EXPECT_EQ(key_c, key_c);
+  EXPECT_FALSE(key_d == key_c);
+  EXPECT_FALSE(key_e == key_c);
+  EXPECT_FALSE(key_f == key_c);
+
+  EXPECT_FALSE(key_a == key_d);
+  EXPECT_FALSE(key_b == key_d);
+  EXPECT_FALSE(key_c == key_d);
+  EXPECT_EQ(key_d, key_d);
+  EXPECT_FALSE(key_e == key_d);
+  EXPECT_FALSE(key_f == key_d);
+
+  EXPECT_FALSE(key_a == key_e);
+  EXPECT_FALSE(key_b == key_e);
+  EXPECT_FALSE(key_c == key_e);
+  EXPECT_FALSE(key_d == key_e);
+  EXPECT_EQ(key_e, key_e);
+  EXPECT_FALSE(key_f == key_e);
+
+  EXPECT_FALSE(key_a == key_f);
+  EXPECT_FALSE(key_b == key_f);
+  EXPECT_FALSE(key_c == key_f);
+  EXPECT_FALSE(key_d == key_f);
+  EXPECT_FALSE(key_e == key_f);
+  EXPECT_EQ(key_f, key_f);
+}
+
+TEST(TaskSchedulerSequenceSortKeyTest, OperatorNotEqual) {
+  SequenceSortKey key_a(TaskPriority::USER_BLOCKING,
+                        TimeTicks::FromInternalValue(1000));
+  SequenceSortKey key_b(TaskPriority::USER_BLOCKING,
+                        TimeTicks::FromInternalValue(2000));
+  SequenceSortKey key_c(TaskPriority::USER_VISIBLE,
+                        TimeTicks::FromInternalValue(1000));
+  SequenceSortKey key_d(TaskPriority::USER_VISIBLE,
+                        TimeTicks::FromInternalValue(2000));
+  SequenceSortKey key_e(TaskPriority::BACKGROUND,
+                        TimeTicks::FromInternalValue(1000));
+  SequenceSortKey key_f(TaskPriority::BACKGROUND,
+                        TimeTicks::FromInternalValue(2000));
+
+  EXPECT_FALSE(key_a != key_a);
+  EXPECT_NE(key_b, key_a);
+  EXPECT_NE(key_c, key_a);
+  EXPECT_NE(key_d, key_a);
+  EXPECT_NE(key_e, key_a);
+  EXPECT_NE(key_f, key_a);
+
+  EXPECT_NE(key_a, key_b);
+  EXPECT_FALSE(key_b != key_b);
+  EXPECT_NE(key_c, key_b);
+  EXPECT_NE(key_d, key_b);
+  EXPECT_NE(key_e, key_b);
+  EXPECT_NE(key_f, key_b);
+
+  EXPECT_NE(key_a, key_c);
+  EXPECT_NE(key_b, key_c);
+  EXPECT_FALSE(key_c != key_c);
+  EXPECT_NE(key_d, key_c);
+  EXPECT_NE(key_e, key_c);
+  EXPECT_NE(key_f, key_c);
+
+  EXPECT_NE(key_a, key_d);
+  EXPECT_NE(key_b, key_d);
+  EXPECT_NE(key_c, key_d);
+  EXPECT_FALSE(key_d != key_d);
+  EXPECT_NE(key_e, key_d);
+  EXPECT_NE(key_f, key_d);
+
+  EXPECT_NE(key_a, key_e);
+  EXPECT_NE(key_b, key_e);
+  EXPECT_NE(key_c, key_e);
+  EXPECT_NE(key_d, key_e);
+  EXPECT_FALSE(key_e != key_e);
+  EXPECT_NE(key_f, key_e);
+
+  EXPECT_NE(key_a, key_f);
+  EXPECT_NE(key_b, key_f);
+  EXPECT_NE(key_c, key_f);
+  EXPECT_NE(key_d, key_f);
+  EXPECT_NE(key_e, key_f);
+  EXPECT_FALSE(key_f != key_f);
+}
+
 }  // namespace internal
 }  // namespace base