(WIP) Worker: Merge ParentFrameTaskRunners into TaskRunnerHelper

third_party/WebKit/Source/core/workers/ParentFrameTaskRunners.h

-// Copyright 2016 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 ParentFrameTaskRunners_h
-#define ParentFrameTaskRunners_h
-
-#include "core/CoreExport.h"
-#include "core/dom/ContextLifecycleObserver.h"
-#include "core/dom/TaskRunnerHelper.h"
-#include "platform/heap/Handle.h"
-#include "wtf/Allocator.h"
-#include "wtf/Noncopyable.h"
-#include "wtf/PtrUtil.h"
-#include <memory>
-
-namespace blink {
-
-class LocalFrame;
-class WebTaskRunner;
-
-// Represents a set of task runners of the parent (or associated) document's
-// frame. This could be accessed from worker thread(s) and must be initialized
-// on the parent context thread (i.e. MainThread) on construction time, rather
-// than being done lazily.
-//
-// This observes LocalFrame lifecycle only for in-process worker cases (i.e.
-// only when a non-null LocalFrame is given).
-class CORE_EXPORT ParentFrameTaskRunners final
-    : public GarbageCollectedFinalized<ParentFrameTaskRunners>,
-      public ContextLifecycleObserver {
-  USING_GARBAGE_COLLECTED_MIXIN(ParentFrameTaskRunners);
-  WTF_MAKE_NONCOPYABLE(ParentFrameTaskRunners);
-
- public:
-  static ParentFrameTaskRunners* create(LocalFrame* frame) {
-    return new ParentFrameTaskRunners(frame);
-  }
-
-  // Might return nullptr for unsupported task types.
-  RefPtr<WebTaskRunner> get(TaskType);
-
-  DECLARE_VIRTUAL_TRACE();
-
- private:
-  using TaskRunnerHashMap = HashMap<TaskType,
-                                    RefPtr<WebTaskRunner>,
-                                    WTF::IntHash<TaskType>,
-                                    TaskTypeTraits>;
-
-  // LocalFrame could be nullptr if the worker is not associated with a
-  // particular local frame.
-  explicit ParentFrameTaskRunners(LocalFrame*);
-
-  void contextDestroyed(ExecutionContext*) override;
-
-  Mutex m_taskRunnersMutex;
-  TaskRunnerHashMap m_taskRunners;
-};
-
-}  // namespace blink
-
-#endif  // ParentFrameTaskRunners_h