Reland of remove EventSender from ImageLoader

third_party/WebKit/Source/core/events/EventSender.h

Index: third_party/WebKit/Source/core/events/EventSender.h
diff --git a/third_party/WebKit/Source/core/events/EventSender.h b/third_party/WebKit/Source/core/events/EventSender.h
deleted file mode 100644
index 74ce9fb9c37104422bbbf5ad8890ee60daa25f12..0000000000000000000000000000000000000000
--- a/third_party/WebKit/Source/core/events/EventSender.h
+++ /dev/null
@@ -1,120 +0,0 @@
-/*
- * Copyright (C) 2012 Apple 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:
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in the
- *    documentation and/or other materials provided with the distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
- * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
- * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
- * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
- * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
- * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
- * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
- * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
- * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
- * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
- * THE POSSIBILITY OF SUCH DAMAGE.
- */
-
-#ifndef EventSender_h
-#define EventSender_h
-
-#include "platform/Timer.h"
-#include "platform/heap/Handle.h"
-#include "platform/wtf/Vector.h"
-#include "platform/wtf/text/AtomicString.h"
-
-namespace blink {
-
-template <typename T>
-class EventSender final : public GarbageCollectedFinalized<EventSender<T>> {
-  WTF_MAKE_NONCOPYABLE(EventSender);
-
- public:
-  static EventSender* Create(const AtomicString& event_type) {
-    return new EventSender(event_type);
-  }
-
-  const AtomicString& EventType() const { return event_type_; }
-  void DispatchEventSoon(T*);
-  void CancelEvent(T*);
-  void DispatchPendingEvents();
-
-#if DCHECK_IS_ON()
-  bool HasPendingEvents(T* sender) const {
-    return dispatch_soon_list_.Find(sender) != kNotFound ||
-           dispatching_list_.Find(sender) != kNotFound;
-  }
-#endif
-
-  DEFINE_INLINE_TRACE() {
-    visitor->Trace(dispatch_soon_list_);
-    visitor->Trace(dispatching_list_);
-  }
-
- private:
-  explicit EventSender(const AtomicString& event_type);
-
-  void TimerFired(TimerBase*) { DispatchPendingEvents(); }
-
-  AtomicString event_type_;
-  Timer<EventSender<T>> timer_;
-  HeapVector<Member<T>> dispatch_soon_list_;
-  HeapVector<Member<T>> dispatching_list_;
-};
-
-template <typename T>
-EventSender<T>::EventSender(const AtomicString& event_type)
-    : event_type_(event_type), timer_(this, &EventSender::TimerFired) {}
-
-template <typename T>
-void EventSender<T>::DispatchEventSoon(T* sender) {
-  dispatch_soon_list_.push_back(sender);
-  if (!timer_.IsActive())
-    timer_.StartOneShot(0, BLINK_FROM_HERE);
-}
-
-template <typename T>
-void EventSender<T>::CancelEvent(T* sender) {
-  // Remove instances of this sender from both lists.
-  // Use loops because we allow multiple instances to get into the lists.
-  for (auto& sender_in_list : dispatch_soon_list_) {
-    if (sender_in_list == sender)
-      sender_in_list = nullptr;
-  }
-  for (auto& sender_in_list : dispatching_list_) {
-    if (sender_in_list == sender)
-      sender_in_list = nullptr;
-  }
-}
-
-template <typename T>
-void EventSender<T>::DispatchPendingEvents() {
-  // Need to avoid re-entering this function; if new dispatches are
-  // scheduled before the parent finishes processing the list, they
-  // will set a timer and eventually be processed.
-  if (!dispatching_list_.IsEmpty())
-    return;
-
-  timer_.Stop();
-
-  dispatching_list_.swap(dispatch_soon_list_);
-  for (auto& sender_in_list : dispatching_list_) {
-    if (T* sender = sender_in_list) {
-      sender_in_list = nullptr;
-      sender->DispatchPendingEvent(this);
-    }
-  }
-  dispatching_list_.clear();
-}
-
-}  // namespace blink
-
-#endif  // EventSender_h