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

third_party/WebKit/Source/platform/scheduler/CancellableTaskFactory.h

 // 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.
 
 #ifndef CancellableTaskFactory_h
 #define CancellableTaskFactory_h
 
 #include "platform/PlatformExport.h"
 #include "platform/heap/Handle.h"
 #include "public/platform/WebTaskRunner.h"
 #include "wtf/Allocator.h"
 #include "wtf/Functional.h"
 #include "wtf/Noncopyable.h"
 #include "wtf/PtrUtil.h"
 #include "wtf/WeakPtr.h"
 #include <memory>
 #include <type_traits>
 
 namespace blink {
 
 class TraceLocation;
 
+// TODO(alexclarke): Consider removing all uses of this in favor of
+// WebTaskRunner::postCancellableDelayedTask instead.
 class PLATFORM_EXPORT CancellableTaskFactory {
     WTF_MAKE_NONCOPYABLE(CancellableTaskFactory);
     USING_FAST_MALLOC(CancellableTaskFactory);
 public:
     // A pair of mutually exclusive factory methods are provided for constructing
     // a CancellableTaskFactory, one for when a Oilpan heap object owns a
     // CancellableTaskFactory, and one when that owning object isn't controlled
     // by Oilpan.
     //
     // In the Oilpan case, as WTF::Closure objects are off-heap, we have to construct the
@@ skipping 52 matching lines @@
         WeakPtr<CancellableTaskFactory> m_weakPtr;
     };
 
     std::unique_ptr<WTF::Closure> m_closure;
     WeakPtrFactory<CancellableTaskFactory> m_weakPtrFactory;
 };
 
 } // namespace blink
 
 #endif // CancellableTaskFactory_h