Optimize posting of WTF::Closure and improve scheduler test mocks

third_party/WebKit/Source/platform/scheduler/test/fake_web_task_runner.cc

+// Copyright 2016 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 "platform/scheduler/test/fake_web_task_runner.h"
+
+namespace blink {
+namespace scheduler {
+
+FakeWebTaskRunner::FakeWebTaskRunner() : time_(0.0) {}
+
+FakeWebTaskRunner::~FakeWebTaskRunner() {}
+
+void FakeWebTaskRunner::setTime(double new_time) {
+  time_ = new_time;
+}
+
+void FakeWebTaskRunner::postTask(const WebTraceLocation&, Task*) {}
+
+void FakeWebTaskRunner::postDelayedTask(const WebTraceLocation&,
+                                        Task* task,
+                                        double) {
+  task_.reset(task);
+}
+
+bool FakeWebTaskRunner::runsTasksOnCurrentThread() {
+  return true;
+}
+
+std::unique_ptr<WebTaskRunner> FakeWebTaskRunner::clone() {
+  return nullptr;
+}
+
+double FakeWebTaskRunner::virtualTimeSeconds() const {
+  return time_;
+}
+
+double FakeWebTaskRunner::monotonicallyIncreasingVirtualTimeSeconds() const {
+  return time_;
+}
+
+SingleThreadTaskRunner* FakeWebTaskRunner::toSingleThreadTaskRunner() {
+  return nullptr;
+}
+
+}  // namespace scheduler
+}  // namespace blink