Reland "Move most of FrameLoader::CheckCompleted() to Document"

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

 // Copyright 2014 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 IncrementLoadEventDelayCount_h
 #define IncrementLoadEventDelayCount_h
 
 #include <memory>
+#include "core/CoreExport.h"
 #include "platform/heap/Handle.h"
 #include "platform/wtf/Allocator.h"
 #include "platform/wtf/Noncopyable.h"
 
 namespace blink {
 
 class Document;
 
 // A helper class that will increment a document's loadEventDelayCount on
 // contruction and decrement it on destruction (semantics similar to RefPtr).
-class IncrementLoadEventDelayCount {
+class CORE_EXPORT IncrementLoadEventDelayCount {
   USING_FAST_MALLOC(IncrementLoadEventDelayCount);
   WTF_MAKE_NONCOPYABLE(IncrementLoadEventDelayCount);
 
  public:
   static std::unique_ptr<IncrementLoadEventDelayCount> Create(Document&);
   ~IncrementLoadEventDelayCount();
 
   // Decrements the loadEventDelayCount and checks load event synchronously,
   // and thus can cause synchronous Document load event/JavaScript execution.
   // Call this only when it is safe, e.g. at the top of an async task.
   // After calling this, |this| no longer blocks document's load event and
   // will not decrement loadEventDelayCount at destruction.
   void ClearAndCheckLoadEvent();
 
   // Increments the new document's count and decrements the old count.
   void DocumentChanged(Document& new_document);
 
  private:
   IncrementLoadEventDelayCount(Document&);
   Persistent<Document> document_;
 };
 }  // namespace blink
 
 #endif