Support external task cancellation mechanisms in base::Callback::IsCancelled

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 <deque>
+
 #include "base/macros.h"
+#include "base/memory/ref_counted.h"
 #include "platform/WebTaskRunner.h"
 #include "wtf/PassRefPtr.h"
 #include "wtf/RefPtr.h"
-#include "base/memory/ref_counted.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;
   void postDelayedTask(const WebTraceLocation&,
                        const base::Closure&,
                        double) override;
   bool runsTasksOnCurrentThread() override;
   std::unique_ptr<WebTaskRunner> clone() override;
   double virtualTimeSeconds() const override;
   double monotonicallyIncreasingVirtualTimeSeconds() const override;
   SingleThreadTaskRunner* toSingleThreadTaskRunner() override;
 
   void runUntilIdle();
+  std::deque<base::Closure> takePendingTasks();
 
  private:
   class Data;
   class BaseTaskRunner;
   RefPtr<Data> data_;
   scoped_refptr<BaseTaskRunner> base_task_runner_;
 
   FakeWebTaskRunner(PassRefPtr<Data> data,
                     scoped_refptr<BaseTaskRunner> base_task_runner);
 
   DISALLOW_COPY_AND_ASSIGN(FakeWebTaskRunner);
 };
 
 }  // namespace scheduler
 }  // namespace blink
 
 #endif  // THIRD_PARTY_WEBKIT_SOURCE_PLATFORM_SCHEDULER_TEST_FAKE_WEB_TASK_RUNNER_H_