scheduler: Implement WebFrameScheduler and WebPageScheduler

components/scheduler/child/task_queue_manager_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 "components/scheduler/child/task_queue_manager.h"
 
 #include "base/location.h"
 #include "base/run_loop.h"
 #include "base/single_thread_task_runner.h"
 #include "base/test/simple_test_tick_clock.h"
@@ skipping 1248 matching lines @@
   std::vector<int> run_order;
   runners_[0]->PostTask(
       FROM_HERE,
       base::Bind(&PostTestTasksFromNestedMessageLoop, message_loop_.get(),
                  runners_[0], runners_[1], base::Unretained(&run_order)));
 
   message_loop_->RunUntilIdle();
   ASSERT_THAT(run_order, ElementsAre(1));
 }
 
+namespace {
+
+class MockObserver : public TaskQueueManager::Observer {
+ public:
+  MOCK_METHOD1(OnUnregisterTaskQueue,
+               void(const scoped_refptr<internal::TaskQueueImpl>& queue));
+};
+
+}  // namespace
+
+TEST_F(TaskQueueManagerTest, OnUnregisterTaskQueue) {
+  Initialize(0u);
+
+  MockObserver observer;
+  manager_->SetObserver(&observer);
+
+  scoped_refptr<internal::TaskQueueImpl> task_queue =
+      manager_->NewTaskQueue(TaskQueue::Spec("test_queue"));
+
+  EXPECT_CALL(observer, OnUnregisterTaskQueue(_)).Times(1);
+  task_queue->UnregisterTaskQueue();
+
+  manager_->SetObserver(nullptr);
+}
+
 }  // namespace scheduler