Post a microtask to load <img> elements.

Source/core/loader/ImageLoader.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2004, 2009 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
@@ skipping 10 matching lines @@
  */
 
 #ifndef ImageLoader_h
 #define ImageLoader_h
 
 #include "core/fetch/ImageResource.h"
 #include "core/fetch/ImageResourceClient.h"
 #include "core/fetch/ResourcePtr.h"
 #include "platform/heap/Handle.h"
 #include "wtf/HashSet.h"
+#include "wtf/WeakPtr.h"
 #include "wtf/text/AtomicString.h"
 
 namespace WebCore {
 
+class IncrementLoadEventDelayCount;
+
 class ImageLoaderClient : public WillBeGarbageCollectedMixin {
 public:
     virtual void notifyImageSourceChanged() = 0;
 
     // Determines whether the observed ImageResource should have higher priority in the decoded resources cache.
     virtual bool requestsHighLiveResourceCachePriority() { return false; }
 
     virtual void trace(Visitor*) { }
 
 protected:
@@ skipping 16 matching lines @@
     // loading if a load hasn't already been started.
     void updateFromElement();
 
     // This function should be called whenever the 'src' attribute is set, even if its value
     // doesn't change; starts new load unconditionally (matches Firefox and Opera behavior).
     void updateFromElementIgnoringPreviousError();
 
     void elementDidMoveToNewDocument();
 
     Element* element() const { return m_element; }
-    bool imageComplete() const { return m_imageComplete; }
+    bool imageComplete() const
+    {
+        return m_imageComplete && !m_pendingTask;
+    }
 
     ImageResource* image() const { return m_image.get(); }
     void setImage(ImageResource*); // Cancels pending load events, and doesn't dispatch new ones.
 
     void setLoadManually(bool loadManually) { m_loadManually = loadManually; }
 
-    bool hasPendingActivity() const { return m_hasPendingLoadEvent || m_hasPendingErrorEvent; }
+    bool hasPendingActivity() const
+    {
+        return m_hasPendingLoadEvent || m_hasPendingErrorEvent || m_pendingTask;
+    }
 
     void dispatchPendingEvent(ImageEventSender*);
 
     static void dispatchPendingLoadEvents();
     static void dispatchPendingErrorEvents();
 
     void addClient(ImageLoaderClient*);
     void removeClient(ImageLoaderClient*);
 
 protected:
     virtual void notifyFinished(Resource*) OVERRIDE;
 
 private:
+    class Task;
+
+    // Called from the task or from updateFromElement to initiate the load.
+    void doUpdateFromElement(bool bypassMainWorldCSP = false);
+
     virtual void dispatchLoadEvent() = 0;
     virtual String sourceURI(const AtomicString&) const = 0;
 
     void updatedHasPendingEvent();
 
     void dispatchPendingLoadEvent();
     void dispatchPendingErrorEvent();
 
     RenderImageResource* renderImageResource();
     void updateRenderer();
 
     void setImageWithoutConsideringPendingLoadEvent(ImageResource*);
     void sourceImageChanged();
     void clearFailedLoadURL();
 
     void timerFired(Timer<ImageLoader>*);
 
+    KURL imageURL() const;
+
+    // Used to determine whether to immediately initiate the load
+    // or to schedule a microtask.
+    bool shouldLoadImmediately(const KURL&) const;
+
     typedef WillBePersistentHeapHashSet<RawPtrWillBeWeakMember<ImageLoaderClient> > ImageLoaderClientSet;
 
     Element* m_element;
     ResourcePtr<ImageResource> m_image;
     ImageLoaderClientSet m_clients;
     Timer<ImageLoader> m_derefElementTimer;
     AtomicString m_failedLoadURL;
+    WeakPtr<Task> m_pendingTask; // owned by Microtask
+    OwnPtr<IncrementLoadEventDelayCount> m_delayLoad;
     bool m_hasPendingLoadEvent : 1;
     bool m_hasPendingErrorEvent : 1;
     bool m_imageComplete : 1;
     bool m_loadManually : 1;
     bool m_elementIsProtected : 1;
     unsigned m_highPriorityClientCount;
 };
 
 }
 
 #endif