Move blink scheduler implementation into a component

content/child/scheduler/webthread_impl_for_worker_scheduler_unittest.cc

-// Copyright 2015 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/child/scheduler/webthread_impl_for_worker_scheduler.h"
-
-#include "base/synchronization/waitable_event.h"
-#include "content/child/scheduler/worker_scheduler_impl.h"
-#include "testing/gmock/include/gmock/gmock.h"
-#include "testing/gtest/include/gtest/gtest.h"
-#include "third_party/WebKit/public/platform/WebTraceLocation.h"
-
-using testing::_;
-using testing::AnyOf;
-using testing::ElementsAre;
-using testing::Invoke;
-
-namespace content {
-namespace {
-
-class NopTask : public blink::WebThread::Task {
- public:
-  ~NopTask() override {}
-
-  void run() {}
-};
-
-class MockTask : public blink::WebThread::Task {
- public:
-  ~MockTask() override {}
-
-  MOCK_METHOD0(run, void());
-};
-
-class MockIdleTask : public blink::WebThread::IdleTask {
- public:
-  ~MockIdleTask() override {}
-
-  MOCK_METHOD1(run, void(double deadline));
-};
-
-class TestObserver : public blink::WebThread::TaskObserver {
- public:
-  explicit TestObserver(std::string* calls) : calls_(calls) {}
-
-  ~TestObserver() override {}
-
-  void willProcessTask() override { calls_->append(" willProcessTask"); }
-
-  void didProcessTask() override { calls_->append(" didProcessTask"); }
-
- private:
-  std::string* calls_;  // NOT OWNED
-};
-
-class TestTask : public blink::WebThread::Task {
- public:
-  explicit TestTask(std::string* calls) : calls_(calls) {}
-
-  ~TestTask() override {}
-
-  void run() override { calls_->append(" run"); }
-
- private:
-  std::string* calls_;  // NOT OWNED
-};
-
-void addTaskObserver(WebThreadImplForWorkerScheduler* thread,
-                     TestObserver* observer) {
-  thread->addTaskObserver(observer);
-}
-
-void removeTaskObserver(WebThreadImplForWorkerScheduler* thread,
-                        TestObserver* observer) {
-  thread->removeTaskObserver(observer);
-}
-
-}  // namespace
-
-class WebThreadImplForWorkerSchedulerTest : public testing::Test {
- public:
-  WebThreadImplForWorkerSchedulerTest() {}
-
-  ~WebThreadImplForWorkerSchedulerTest() override {}
-
-  void SetUp() override {
-    thread_.reset(new WebThreadImplForWorkerScheduler("test thread"));
-  }
-
-  void RunOnWorkerThread(const tracked_objects::Location& from_here,
-                         const base::Closure& task) {
-    base::WaitableEvent completion(false, false);
-    thread_->TaskRunner()->PostTask(
-        from_here,
-        base::Bind(&WebThreadImplForWorkerSchedulerTest::RunOnWorkerThreadTask,
-                   base::Unretained(this), task, &completion));
-    completion.Wait();
-  }
-
- protected:
-  void RunOnWorkerThreadTask(const base::Closure& task,
-                             base::WaitableEvent* completion) {
-    task.Run();
-    completion->Signal();
-  }
-
-  scoped_ptr<WebThreadImplForWorkerScheduler> thread_;
-
-  DISALLOW_COPY_AND_ASSIGN(WebThreadImplForWorkerSchedulerTest);
-};
-
-TEST_F(WebThreadImplForWorkerSchedulerTest, TestDefaultTask) {
-  scoped_ptr<MockTask> task(new MockTask());
-  base::WaitableEvent completion(false, false);
-
-  EXPECT_CALL(*task, run());
-  ON_CALL(*task, run())
-      .WillByDefault(Invoke([&completion]() { completion.Signal(); }));
-
-  thread_->postTask(blink::WebTraceLocation(), task.release());
-  completion.Wait();
-}
-
-TEST_F(WebThreadImplForWorkerSchedulerTest,
-       TestTaskExecutedBeforeThreadDeletion) {
-  scoped_ptr<MockTask> task(new MockTask());
-  base::WaitableEvent completion(false, false);
-
-  EXPECT_CALL(*task, run());
-  ON_CALL(*task, run())
-      .WillByDefault(Invoke([&completion]() { completion.Signal(); }));
-
-  thread_->postTask(blink::WebTraceLocation(), task.release());
-  thread_.reset();
-}
-
-TEST_F(WebThreadImplForWorkerSchedulerTest, TestIdleTask) {
-  scoped_ptr<MockIdleTask> task(new MockIdleTask());
-  base::WaitableEvent completion(false, false);
-
-  EXPECT_CALL(*task, run(_));
-  ON_CALL(*task, run(_))
-      .WillByDefault(Invoke([&completion](double) { completion.Signal(); }));
-
-  thread_->postIdleTask(blink::WebTraceLocation(), task.release());
-  // We need to post a wakeup task or idle work will never happen.
-  thread_->postDelayedTask(blink::WebTraceLocation(), new NopTask(), 50ul);
-
-  completion.Wait();
-}
-
-TEST_F(WebThreadImplForWorkerSchedulerTest, TestTaskObserver) {
-  std::string calls;
-  TestObserver observer(&calls);
-
-  RunOnWorkerThread(FROM_HERE,
-                    base::Bind(&addTaskObserver, thread_.get(), &observer));
-  thread_->postTask(blink::WebTraceLocation(), new TestTask(&calls));
-  RunOnWorkerThread(FROM_HERE,
-                    base::Bind(&removeTaskObserver, thread_.get(), &observer));
-
-  // We need to be careful what we test here.  We want to make sure the
-  // observers are un in the expected order before and after the task.
-  // Sometimes we get an internal scheduler task running before or after
-  // TestTask as well. This is not a bug, and we need to make sure the test
-  // doesn't fail when that happens.
-  EXPECT_THAT(calls, testing::HasSubstr("willProcessTask run didProcessTask"));
-}
-
-}  // namespace content