[Reland] Make canceling Timers fast.

third_party/WebKit/Source/platform/scheduler/child/web_task_runner_impl.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 "platform/scheduler/child/web_task_runner_impl.h"
 
 #include "base/bind.h"
 #include "base/location.h"
 #include "base/memory/ptr_util.h"
 #include "public/platform/scheduler/base/task_queue.h"
@@ skipping 18 matching lines @@
 void WebTaskRunnerImpl::postDelayedTask(const blink::WebTraceLocation& location,
                                         blink::WebTaskRunner::Task* task,
                                         double delayMs) {
   DCHECK_GE(delayMs, 0.0);
   task_queue_->PostDelayedTask(location,
                                base::Bind(&WebTaskRunnerImpl::runTask,
                                           base::Passed(base::WrapUnique(task))),
                                base::TimeDelta::FromMillisecondsD(delayMs));
 }
 
+void WebTaskRunnerImpl::postDelayedTask(const WebTraceLocation& location,
+                                        const base::Closure& task,
+                                        double delayMs) {
+  DCHECK_GE(delayMs, 0.0);
+  task_queue_->PostDelayedTask(location, task,
+                               base::TimeDelta::FromMillisecondsD(delayMs));
+}
+
 bool WebTaskRunnerImpl::runsTasksOnCurrentThread() {
   return task_queue_->RunsTasksOnCurrentThread();
 }
 
 double WebTaskRunnerImpl::virtualTimeSeconds() const {
   return (Now() - base::TimeTicks::UnixEpoch()).InSecondsF();
 }
 
 double WebTaskRunnerImpl::monotonicallyIncreasingVirtualTimeSeconds() const {
   return Now().ToInternalValue() /
@@ skipping 17 matching lines @@
   return task_queue_.get();
 }
 
 void WebTaskRunnerImpl::runTask(
     std::unique_ptr<blink::WebTaskRunner::Task> task) {
   task->run();
 }
 
 }  // namespace scheduler
 }  // namespace blink