Use ParentFrameTaskRunners in WorkerLoaderProxyProvider::postTaskToLoader impls

third_party/WebKit/Source/core/dom/ExecutionContextTask.h

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Neither the name of Google Inc. nor the names of its
@@ skipping 30 matching lines @@
 class ExecutionContext;
 
 class CORE_EXPORT ExecutionContextTask {
   WTF_MAKE_NONCOPYABLE(ExecutionContextTask);
   USING_FAST_MALLOC(ExecutionContextTask);
 
  public:
   ExecutionContextTask() {}
   virtual ~ExecutionContextTask() {}
   virtual void performTask(ExecutionContext*) = 0;
+
+  void performTaskIfContextIsValid(ExecutionContext* context) {
+    if (context)
+      performTask(context);
+  }
 };
 
 namespace internal {
 
 template <WTF::FunctionThreadAffinity threadAffinity>
 void runCallClosureTask(
     std::unique_ptr<Function<void(), threadAffinity>> closure,
     ExecutionContext*) {
   (*closure)();
 }
@@ skipping 96 matching lines @@
 std::unique_ptr<ExecutionContextTask> createCrossThreadTask(
     FunctionType function,
     P&&... parameters) {
   return internal::createCallClosureTask(
       crossThreadBind(function, std::forward<P>(parameters)...));
 }
 
 }  // namespace blink
 
 #endif