Post a microtask to load <img> elements.

Source/core/dom/IncrementLoadEventDelayCount.h

Index: Source/core/dom/IncrementLoadEventDelayCount.h
diff --git a/Source/core/dom/IncrementLoadEventDelayCount.h b/Source/core/dom/IncrementLoadEventDelayCount.h
new file mode 100644
index 0000000000000000000000000000000000000000..d588de22a6181a920dbe918b2c8f59de97c1ef8c
--- /dev/null
+++ b/Source/core/dom/IncrementLoadEventDelayCount.h
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+// 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 "wtf/Noncopyable.h"
+#include "wtf/RefPtr.h"
+
+namespace WebCore {
+
+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 {
+    WTF_MAKE_NONCOPYABLE(IncrementLoadEventDelayCount);
+
+public:
+    IncrementLoadEventDelayCount(Document&);
+    ~IncrementLoadEventDelayCount();
+
+    // Increments the new document's count and decrements the old count.
+    void documentChanged(Document& newDocument);
+
+private:
+    RefPtr<Document> m_document;
+};
+}
+
+#endif