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

third_party/WebKit/Source/platform/scheduler/child/web_task_runner_impl.cc

Index: third_party/WebKit/Source/platform/scheduler/child/web_task_runner_impl.cc
diff --git a/third_party/WebKit/Source/platform/scheduler/child/web_task_runner_impl.cc b/third_party/WebKit/Source/platform/scheduler/child/web_task_runner_impl.cc
index 3144fcaab010338f256d487ca876de7862375d58..d1006e1e45185b378a0ddae850ee353b1c40150c 100644
--- a/third_party/WebKit/Source/platform/scheduler/child/web_task_runner_impl.cc
+++ b/third_party/WebKit/Source/platform/scheduler/child/web_task_runner_impl.cc
@@ -36,6 +36,18 @@ void WebTaskRunnerImpl::postDelayedTask(const blink::WebTraceLocation& location,
                                base::TimeDelta::FromMillisecondsD(delayMs));
 }
 
+TaskQueue::TaskHandle WebTaskRunnerImpl::postCancellableDelayedTask(
+    const tracked_objects::Location& from_here,
+    const base::Closure& task,
+    double delayMs) {
+  return task_queue_->PostCancellableDelayedTask(
+      from_here, task, base::TimeDelta::FromMillisecondsD(delayMs));
+}
+
+bool WebTaskRunnerImpl::cancelTask(const TaskQueue::TaskHandle& handle) {
+  return task_queue_->CancelTask(handle);
+}
+
 bool WebTaskRunnerImpl::runsTasksOnCurrentThread() {
   return task_queue_->RunsTasksOnCurrentThread();
 }
@@ -62,7 +74,7 @@ std::unique_ptr<blink::WebTaskRunner> WebTaskRunnerImpl::clone() {
   return base::WrapUnique(new WebTaskRunnerImpl(task_queue_));
 }
 
-base::SingleThreadTaskRunner* WebTaskRunnerImpl::taskRunner() {
+base::SingleThreadTaskRunner* WebTaskRunnerImpl::toSingleThreadTaskRunner() {
   return task_queue_.get();
 }