[Reland] Make canceling Timers fast.

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

Index: third_party/WebKit/Source/platform/scheduler/test/fake_web_task_runner.cc
diff --git a/third_party/WebKit/Source/platform/scheduler/test/fake_web_task_runner.cc b/third_party/WebKit/Source/platform/scheduler/test/fake_web_task_runner.cc
index eb0a7e11f41b30dd8ca9834a9b0baa08d24f9e8e..36536c6d40370178f54fe69b0c0cd8a57d6a43f3 100644
--- a/third_party/WebKit/Source/platform/scheduler/test/fake_web_task_runner.cc
+++ b/third_party/WebKit/Source/platform/scheduler/test/fake_web_task_runner.cc
@@ -15,6 +15,7 @@ class FakeWebTaskRunner::Data : public WTF::ThreadSafeRefCounted<Data> {
   Data() : time_(0.0) {}
 
   std::unique_ptr<Task> task_;
+  base::Closure closure_;
   double time_;
 
  private:
@@ -47,6 +48,12 @@ void FakeWebTaskRunner::postDelayedTask(const WebTraceLocation&,
   data_->task_.reset(task);
 }
 
+void FakeWebTaskRunner::postDelayedTask(const WebTraceLocation&,
+                                        const base::Closure& closure,
+                                        double) {
+  data_->closure_ = closure;
+}
+
 bool FakeWebTaskRunner::runsTasksOnCurrentThread() {
   return true;
 }