Introduce a SchedulerHelper in content/child/scheduler

content/renderer/scheduler/renderer_task_queue_selector_unittest.cc

-// Copyright 2014 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 "content/renderer/scheduler/renderer_task_queue_selector.h"
-
-#include "base/bind.h"
-#include "base/memory/scoped_ptr.h"
-#include "base/memory/scoped_vector.h"
-#include "base/pending_task.h"
-#include "testing/gmock/include/gmock/gmock.h"
-#include "testing/gtest/include/gtest/gtest.h"
-
-namespace content {
-
-class RendererTaskQueueSelectorTest : public testing::Test {
- public:
-  RendererTaskQueueSelectorTest()
-      : test_closure_(
-            base::Bind(&RendererTaskQueueSelectorTest::TestFunction)) {}
-  ~RendererTaskQueueSelectorTest() override {}
-
-  std::vector<base::PendingTask> GetTasks(int count) {
-    std::vector<base::PendingTask> tasks;
-    for (int i = 0; i < count; i++) {
-      base::PendingTask task = base::PendingTask(FROM_HERE, test_closure_);
-      task.sequence_num = i;
-      tasks.push_back(task);
-    }
-    return tasks;
-  }
-
-  void PushTasks(const std::vector<base::PendingTask>& tasks,
-                 const size_t queue_indices[]) {
-    for (size_t i = 0; i < tasks.size(); i++) {
-      task_queues_[queue_indices[i]]->push(tasks[i]);
-    }
-  }
-
-  std::vector<size_t> PopTasks() {
-    std::vector<size_t> order;
-    size_t chosen_queue_index;
-    while (selector_.SelectWorkQueueToService(&chosen_queue_index)) {
-      order.push_back(chosen_queue_index);
-      task_queues_[chosen_queue_index]->pop();
-    }
-    return order;
-  }
-
-  static void TestFunction() {}
-
- protected:
-  void SetUp() final {
-    std::vector<const base::TaskQueue*> const_task_queues;
-    for (size_t i = 0; i < kTaskQueueCount; i++) {
-      scoped_ptr<base::TaskQueue> task_queue(new base::TaskQueue());
-      const_task_queues.push_back(task_queue.get());
-      task_queues_.push_back(task_queue.release());
-    }
-    selector_.RegisterWorkQueues(const_task_queues);
-    for (size_t i = 0; i < kTaskQueueCount; i++)
-      EXPECT_TRUE(selector_.IsQueueEnabled(i)) << i;
-  }
-
-  const size_t kTaskQueueCount = 5;
-  base::Closure test_closure_;
-  RendererTaskQueueSelector selector_;
-  ScopedVector<base::TaskQueue> task_queues_;
-};
-
-TEST_F(RendererTaskQueueSelectorTest, TestDefaultPriority) {
-  std::vector<base::PendingTask> tasks = GetTasks(5);
-  size_t queue_order[] = {4, 3, 2, 1, 0};
-  PushTasks(tasks, queue_order);
-  EXPECT_THAT(PopTasks(), testing::ElementsAre(4, 3, 2, 1, 0));
-}
-
-TEST_F(RendererTaskQueueSelectorTest, TestHighPriority) {
-  std::vector<base::PendingTask> tasks = GetTasks(5);
-  size_t queue_order[] = {0, 1, 2, 3, 4};
-  PushTasks(tasks, queue_order);
-  selector_.SetQueuePriority(2, RendererTaskQueueSelector::HIGH_PRIORITY);
-  EXPECT_THAT(PopTasks(), testing::ElementsAre(2, 0, 1, 3, 4));
-}
-
-TEST_F(RendererTaskQueueSelectorTest, TestBestEffortPriority) {
-  std::vector<base::PendingTask> tasks = GetTasks(5);
-  size_t queue_order[] = {0, 1, 2, 3, 4};
-  PushTasks(tasks, queue_order);
-  selector_.SetQueuePriority(0,
-                             RendererTaskQueueSelector::BEST_EFFORT_PRIORITY);
-  selector_.SetQueuePriority(2, RendererTaskQueueSelector::HIGH_PRIORITY);
-  EXPECT_THAT(PopTasks(), testing::ElementsAre(2, 1, 3, 4, 0));
-}
-
-TEST_F(RendererTaskQueueSelectorTest, TestControlPriority) {
-  std::vector<base::PendingTask> tasks = GetTasks(5);
-  size_t queue_order[] = {0, 1, 2, 3, 4};
-  PushTasks(tasks, queue_order);
-  selector_.SetQueuePriority(4, RendererTaskQueueSelector::CONTROL_PRIORITY);
-  EXPECT_TRUE(selector_.IsQueueEnabled(4));
-  selector_.SetQueuePriority(2, RendererTaskQueueSelector::HIGH_PRIORITY);
-  EXPECT_TRUE(selector_.IsQueueEnabled(2));
-  EXPECT_THAT(PopTasks(), testing::ElementsAre(4, 2, 0, 1, 3));
-}
-
-TEST_F(RendererTaskQueueSelectorTest, TestDisableEnable) {
-  std::vector<base::PendingTask> tasks = GetTasks(5);
-  size_t queue_order[] = {0, 1, 2, 3, 4};
-  PushTasks(tasks, queue_order);
-  selector_.DisableQueue(2);
-  EXPECT_FALSE(selector_.IsQueueEnabled(2));
-  selector_.DisableQueue(4);
-  EXPECT_FALSE(selector_.IsQueueEnabled(4));
-  EXPECT_THAT(PopTasks(), testing::ElementsAre(0, 1, 3));
-  selector_.EnableQueue(2, RendererTaskQueueSelector::BEST_EFFORT_PRIORITY);
-  EXPECT_THAT(PopTasks(), testing::ElementsAre(2));
-  selector_.EnableQueue(4, RendererTaskQueueSelector::NORMAL_PRIORITY);
-  EXPECT_THAT(PopTasks(), testing::ElementsAre(4));
-}
-
-TEST_F(RendererTaskQueueSelectorTest, TestEmptyQueues) {
-  size_t chosen_queue_index = 0;
-  EXPECT_FALSE(selector_.SelectWorkQueueToService(&chosen_queue_index));
-
-  // Test only disabled queues.
-  std::vector<base::PendingTask> tasks = GetTasks(1);
-  size_t queue_order[] = {0};
-  PushTasks(tasks, queue_order);
-  selector_.DisableQueue(0);
-  EXPECT_FALSE(selector_.IsQueueEnabled(0));
-  EXPECT_FALSE(selector_.SelectWorkQueueToService(&chosen_queue_index));
-}
-
-TEST_F(RendererTaskQueueSelectorTest, TestDelay) {
-  std::vector<base::PendingTask> tasks = GetTasks(5);
-  tasks[0].delayed_run_time =
-      base::TimeTicks() + base::TimeDelta::FromMilliseconds(200);
-  tasks[3].delayed_run_time =
-      base::TimeTicks() + base::TimeDelta::FromMilliseconds(100);
-  size_t queue_order[] = {0, 1, 2, 3, 4};
-  PushTasks(tasks, queue_order);
-  EXPECT_THAT(PopTasks(), testing::ElementsAre(1, 2, 4, 3, 0));
-}
-
-TEST_F(RendererTaskQueueSelectorTest, TestControlStarvesOthers) {
-  std::vector<base::PendingTask> tasks = GetTasks(4);
-  size_t queue_order[] = {0, 1, 2, 3};
-  PushTasks(tasks, queue_order);
-  selector_.SetQueuePriority(3, RendererTaskQueueSelector::CONTROL_PRIORITY);
-  selector_.SetQueuePriority(2, RendererTaskQueueSelector::HIGH_PRIORITY);
-  selector_.SetQueuePriority(1,
-                             RendererTaskQueueSelector::BEST_EFFORT_PRIORITY);
-  for (int i = 0; i < 100; i++) {
-    size_t chosen_queue_index = 0;
-    EXPECT_TRUE(selector_.SelectWorkQueueToService(&chosen_queue_index));
-    EXPECT_EQ(3ul, chosen_queue_index);
-    // Don't remove task from queue to simulate all queues still being full.
-  }
-}
-
-TEST_F(RendererTaskQueueSelectorTest, TestHighPriorityDoesNotStarveNormal) {
-  std::vector<base::PendingTask> tasks = GetTasks(3);
-  size_t queue_order[] = {0, 1, 2};
-  PushTasks(tasks, queue_order);
-  selector_.SetQueuePriority(2, RendererTaskQueueSelector::HIGH_PRIORITY);
-  selector_.SetQueuePriority(1,
-                             RendererTaskQueueSelector::BEST_EFFORT_PRIORITY);
-  size_t counts[] = {0, 0, 0};
-  for (int i = 0; i < 100; i++) {
-    size_t chosen_queue_index = 0;
-    EXPECT_TRUE(selector_.SelectWorkQueueToService(&chosen_queue_index));
-    counts[chosen_queue_index]++;
-    // Don't remove task from queue to simulate all queues still being full.
-  }
-  EXPECT_GT(counts[0], 0ul);        // Check high doesn't starve normal.
-  EXPECT_GT(counts[2], counts[0]);  // Check high gets more chance to run.
-  EXPECT_EQ(0ul, counts[1]);        // Check best effort is starved.
-}
-
-TEST_F(RendererTaskQueueSelectorTest, TestBestEffortGetsStarved) {
-  std::vector<base::PendingTask> tasks = GetTasks(2);
-  size_t queue_order[] = {0, 1};
-  PushTasks(tasks, queue_order);
-  selector_.SetQueuePriority(0,
-                             RendererTaskQueueSelector::BEST_EFFORT_PRIORITY);
-  selector_.SetQueuePriority(1, RendererTaskQueueSelector::NORMAL_PRIORITY);
-  size_t chosen_queue_index = 0;
-  for (int i = 0; i < 100; i++) {
-    EXPECT_TRUE(selector_.SelectWorkQueueToService(&chosen_queue_index));
-    EXPECT_EQ(1ul, chosen_queue_index);
-    // Don't remove task from queue to simulate all queues still being full.
-  }
-  selector_.SetQueuePriority(1, RendererTaskQueueSelector::HIGH_PRIORITY);
-  for (int i = 0; i < 100; i++) {
-    EXPECT_TRUE(selector_.SelectWorkQueueToService(&chosen_queue_index));
-    EXPECT_EQ(1ul, chosen_queue_index);
-    // Don't remove task from queue to simulate all queues still being full.
-  }
-  selector_.SetQueuePriority(1, RendererTaskQueueSelector::CONTROL_PRIORITY);
-  for (int i = 0; i < 100; i++) {
-    EXPECT_TRUE(selector_.SelectWorkQueueToService(&chosen_queue_index));
-    EXPECT_EQ(1ul, chosen_queue_index);
-    // Don't remove task from queue to simulate all queues still being full.
-  }
-}
-
-}  // namespace content