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

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

+// 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.
+
+#ifndef THIRD_PARTY_WEBKIT_SOURCE_PLATFORM_SCHEDULER_TEST_FAKE_WEB_TASK_RUNNER_H_
+#define THIRD_PARTY_WEBKIT_SOURCE_PLATFORM_SCHEDULER_TEST_FAKE_WEB_TASK_RUNNER_H_
+
+#include "base/macros.h"
+#include "public/platform/WebTaskRunner.h"
+
+namespace blink {
+namespace scheduler {
+
+// A dummy WebTaskRunner for tests.
+class FakeWebTaskRunner : public WebTaskRunner {
+ public:
+  FakeWebTaskRunner();
+  ~FakeWebTaskRunner() override;
+
+  void setTime(double new_time);
+
+  // WebTaskRunner implementation:
+  void postTask(const WebTraceLocation&, Task*) override;
+  void postDelayedTask(const WebTraceLocation&, Task*, double) override;
+  bool runsTasksOnCurrentThread() override;
+  std::unique_ptr<WebTaskRunner> clone() override;
+  double virtualTimeSeconds() const override;
+  double monotonicallyIncreasingVirtualTimeSeconds() const override;
+  SingleThreadTaskRunner* toSingleThreadTaskRunner() override;
+
+ private:
+  std::unique_ptr<Task> task_;
+  double time_;
+
+  DISALLOW_COPY_AND_ASSIGN(FakeWebTaskRunner);
+};
+
+}  // namespace scheduler
+}  // namespace blink
+
+#endif  // THIRD_PARTY_WEBKIT_SOURCE_PLATFORM_SCHEDULER_TEST_FAKE_WEB_TASK_RUNNER_H_