[scheduler]: Avoid waking up the scheduler to end long idle periods.

components/scheduler/child/nestable_task_runner_for_test.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 "components/scheduler/child/nestable_task_runner_for_test.h"
 
+#include "base/bind.h"
+#include "base/bind_helpers.h"
+
 namespace scheduler {
 
 // static
 scoped_refptr<NestableTaskRunnerForTest> NestableTaskRunnerForTest::Create(
     scoped_refptr<base::SingleThreadTaskRunner> task_runner) {
   return make_scoped_refptr(new NestableTaskRunnerForTest(task_runner));
 }
 
 NestableTaskRunnerForTest::NestableTaskRunnerForTest(
     scoped_refptr<base::SingleThreadTaskRunner> task_runner)
-    : task_runner_(task_runner), is_nested_(false) {
+    : task_runner_(task_runner), is_nested_(false), weak_factory_(this) {
+  weak_nestable_task_runner_ptr_ = weak_factory_.GetWeakPtr();
 }
 
 NestableTaskRunnerForTest::~NestableTaskRunnerForTest() {
 }
 
+void NestableTaskRunnerForTest::WrapTask(
+    const base::PendingTask* wrapped_task) {
+  FOR_EACH_OBSERVER(base::MessageLoop::TaskObserver, task_observers_,
+                    DidProcessTask(*wrapped_task));
+  wrapped_task->task.Run();
+  FOR_EACH_OBSERVER(base::MessageLoop::TaskObserver, task_observers_,
+                    WillProcessTask(*wrapped_task));
+}
+
 bool NestableTaskRunnerForTest::PostDelayedTask(
     const tracked_objects::Location& from_here,
     const base::Closure& task,
     base::TimeDelta delay) {
-  return task_runner_->PostDelayedTask(from_here, task, delay);
+  base::PendingTask* wrapped_task = new base::PendingTask(from_here, task);
+  return task_runner_->PostDelayedTask(
+      from_here,
+      base::Bind(&NestableTaskRunnerForTest::WrapTask,
+                 weak_nestable_task_runner_ptr_, base::Owned(wrapped_task)),
+      delay);
 }
 
 bool NestableTaskRunnerForTest::PostNonNestableDelayedTask(
     const tracked_objects::Location& from_here,
     const base::Closure& task,
     base::TimeDelta delay) {
-  return task_runner_->PostNonNestableDelayedTask(from_here, task, delay);
+  base::PendingTask* wrapped_task = new base::PendingTask(from_here, task);
+  return task_runner_->PostNonNestableDelayedTask(
+      from_here,
+      base::Bind(&NestableTaskRunnerForTest::WrapTask,
+                 weak_nestable_task_runner_ptr_, base::Owned(wrapped_task)),
+      delay);
 }
 
 bool NestableTaskRunnerForTest::RunsTasksOnCurrentThread() const {
   return task_runner_->RunsTasksOnCurrentThread();
 }
 
 bool NestableTaskRunnerForTest::IsNested() const {
   return is_nested_;
 }
 
 void NestableTaskRunnerForTest::SetNested(bool is_nested) {
   is_nested_ = is_nested;
 }
 
+void NestableTaskRunnerForTest::AddTaskObserver(
+    base::MessageLoop::TaskObserver* task_observer) {
+  task_observers_.AddObserver(task_observer);
+}
+
+void NestableTaskRunnerForTest::RemoveTaskObserver(
+    base::MessageLoop::TaskObserver* task_observer) {
+  task_observers_.RemoveObserver(task_observer);
+}
+
 }  // namespace scheduler