[Reland] Make canceling Timers fast.

third_party/WebKit/Source/platform/scheduler/child/compositor_worker_scheduler.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 "public/platform/scheduler/child/compositor_worker_scheduler.h"
 
 #include "base/message_loop/message_loop.h"
 #include "base/threading/thread.h"
 
 namespace blink {
 namespace scheduler {
 
 // TODO(scheduler-dev): Get rid of this asap!
 namespace {
 class CompositorWorkerTaskRunnerWrapper : public TaskQueue {
  public:
   explicit CompositorWorkerTaskRunnerWrapper(
       scoped_refptr<base::SingleThreadTaskRunner> task_runner)
       : task_runner_(task_runner) {}
 
   // TaskQueue implementation:
   void UnregisterTaskQueue() override { NOTREACHED(); }
 
   bool RunsTasksOnCurrentThread() const override {
     return task_runner_->RunsTasksOnCurrentThread();
   }
 
-  TaskQueue::TaskHandle PostCancellableDelayedTask(
-      const tracked_objects::Location& from_here,
-      const base::Closure& task,
-      base::TimeDelta delay) {
-    NOTREACHED();
-    return TaskHandle();
-  }
-
-  bool CancelTask(const TaskQueue::TaskHandle& handle) {
-    NOTREACHED();
-    return false;
-  }
-
-  bool IsTaskPending(const TaskQueue::TaskHandle& handle) const {
-    NOTREACHED();
-    return false;
-  }
-
   bool PostDelayedTask(const tracked_objects::Location& from_here,
                        const base::Closure& task,
                        base::TimeDelta delay) override {
     return task_runner_->PostDelayedTask(from_here, task, delay);
   }
 
   bool PostNonNestableDelayedTask(const tracked_objects::Location& from_here,
                                   const base::Closure& task,
                                   base::TimeDelta delay) override {
     return task_runner_->PostNonNestableDelayedTask(from_here, task, delay);
@@ skipping 114 matching lines @@
   // TODO(flackr): Return the next frame time as the deadline instead.
   // TODO(flackr): Ensure that oilpan GC does happen on the compositor thread
   // even though we will have no long idle periods. https://crbug.com/609531
   return base::TimeTicks::Now() + base::TimeDelta::FromMillisecondsD(16.7);
 }
 
 void CompositorWorkerScheduler::DidProcessIdleTask() {}
 
 }  // namespace scheduler
 }  // namespace blink