Implement WebFrameScheduler and WebPageScheduler

components/scheduler/child/task_queue_manager_unittest.cc

Index: components/scheduler/child/task_queue_manager_unittest.cc
diff --git a/components/scheduler/child/task_queue_manager_unittest.cc b/components/scheduler/child/task_queue_manager_unittest.cc
index c35861a1e5738a7953b7dc8d515ba232d0cefcf4..dac0447dafe5d41153e3711d5cfae2b9e1ba7772 100644
--- a/components/scheduler/child/task_queue_manager_unittest.cc
+++ b/components/scheduler/child/task_queue_manager_unittest.cc
@@ -1237,4 +1237,28 @@ TEST_F(TaskQueueManagerTest, UnregisterTaskQueue_WithDelayedTasks) {
   ASSERT_THAT(run_order, ElementsAre(1, 3));
 }
 
+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_->SetQueueObserver(&observer);
+
+  scoped_refptr<internal::TaskQueueImpl> task_queue =
+      manager_->NewTaskQueue(TaskQueue::Spec("test_queue"));
+
+  EXPECT_CALL(observer, OnUnregisterTaskQueue(_)).Times(2);
+  task_queue->UnregisterTaskQueue();
+
+  // Tidy up.
+  manager_->SetQueueObserver(nullptr);
+}
+
 }  // namespace scheduler