Adds a CancellableTaskFactory and exposes postLoadingTasks to Blink

Source/platform/scheduler/ClosureRunnerTask.cpp

Index: Source/platform/scheduler/ClosureRunnerTask.cpp
diff --git a/Source/core/fetch/AccessControlStatus.h b/Source/platform/scheduler/ClosureRunnerTask.cpp
similarity index 54%
copy from Source/core/fetch/AccessControlStatus.h
copy to Source/platform/scheduler/ClosureRunnerTask.cpp
index a697fc6d5041e01bac03fba3f930d4d62c1f5e17..5ff25b5953e1566fa242cb663a24c7fe0d30e06c 100644
--- a/Source/core/fetch/AccessControlStatus.h
+++ b/Source/platform/scheduler/ClosureRunnerTask.cpp
@@ -2,16 +2,14 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef AccessControlStatus_h
-#define AccessControlStatus_h
+#include "config.h"
+#include "platform/scheduler/ClosureRunnerTask.h"
 
 namespace blink {
 
-enum AccessControlStatus {
-    NotSharableCrossOrigin,
-    SharableCrossOrigin
-};
+void ClosureRunnerTask::run()
+{
+    (*m_closure)();
+}
 
 } // namespace blink
-
-#endif // AccessControlStatus_h