TaskScheduler: Initialize TaskTraits with the priority of the current thread.

base/task_scheduler/task_traits_unittest.cc

Index: base/task_scheduler/task_traits_unittest.cc
diff --git a/base/task_scheduler/task_traits_unittest.cc b/base/task_scheduler/task_traits_unittest.cc
new file mode 100644
index 0000000000000000000000000000000000000000..fed3f9963e8c56e1c88acf3257cf5d18fc1db1a1
--- /dev/null
+++ b/base/task_scheduler/task_traits_unittest.cc
@@ -0,0 +1,32 @@
+// 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/task_traits.h"
+
+#include "base/task_scheduler/scoped_set_task_priority_for_current_thread.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace base {
+
+// Verify that TaskTraits is initialized with the priority of the task running
+// on the current thread.
+TEST(TaskSchedulerTaskTraitsTest, DefaultPriority) {
+  {
+    internal::ScopedSetTaskPriorityForCurrentThread scope(
+        TaskPriority::BACKGROUND);
+    EXPECT_EQ(TaskPriority::BACKGROUND, TaskTraits().priority());
+  }
+  {
+    internal::ScopedSetTaskPriorityForCurrentThread scope(
+        TaskPriority::USER_VISIBLE);
+    EXPECT_EQ(TaskPriority::USER_VISIBLE, TaskTraits().priority());
+  }
+  {
+    internal::ScopedSetTaskPriorityForCurrentThread scope(
+        TaskPriority::USER_BLOCKING);
+    EXPECT_EQ(TaskPriority::USER_BLOCKING, TaskTraits().priority());
+  }
+}
+
+}  // namespace base