Add decode() functionality to image elements.

third_party/WebKit/Source/core/html/HTMLImageElement.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2004, 2008, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2010 Google 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 81 matching lines @@
   void setHeight(unsigned);
 
   KURL src() const;
   void setSrc(const String&);
 
   void setWidth(unsigned);
 
   int x() const;
   int y() const;
 
+  ScriptPromise decode(ScriptState*, ExceptionState&);
+
   bool complete() const;
 
   bool hasPendingActivity() const final {
     return imageLoader().hasPendingActivity();
   }
 
   bool canContainRangeEndPoint() const override { return false; }
 
   const AtomicString imageSourceURL() const override;
 
@@ skipping 58 matching lines @@
   };
 
   explicit HTMLImageElement(Document&,
                             bool createdByParser = false);
 
   void didMoveToNewDocument(Document& oldDocument) override;
 
   void didAddUserAgentShadowRoot(ShadowRoot&) override;
   PassRefPtr<ComputedStyle> customStyleForLayoutObject() override;
 
+  void defaultEventHandler(Event*) override;
+
  private:
   bool areAuthorShadowsAllowed() const override { return false; }
 
   void parseAttribute(const AttributeModificationParams&) override;
   bool isPresentationAttribute(const QualifiedName&) const override;
   void collectStyleForPresentationAttribute(const QualifiedName&,
                                             const AtomicString&,
                                             MutableStylePropertySet*) override;
   void setLayoutDisposition(LayoutDisposition, bool forceReattach = false);
 
@@ skipping 15 matching lines @@
   bool isInteractiveContent() const override;
   Image* imageContents() override;
 
   void resetFormOwner();
   ImageCandidate findBestFitImageFromPictureParent();
   void setBestFitURLAndDPRFromImageCandidate(const ImageCandidate&);
   HTMLImageLoader& imageLoader() const { return *m_imageLoader; }
   void notifyViewportChanged();
   void createMediaQueryListIfDoesNotExist();
 
+  void requestDecode();
+  void didDecode(bool success);
+
   Member<HTMLImageLoader> m_imageLoader;
   Member<ViewportChangeListener> m_listener;
   Member<HTMLFormElement> m_form;
   AtomicString m_bestFitImageURL;
   float m_imageDevicePixelRatio;
   Member<HTMLSourceElement> m_source;
   LayoutDisposition m_layoutDisposition;
   unsigned m_formWasSetByParser : 1;
   unsigned m_elementCreatedByParser : 1;
   unsigned m_isFallbackImage : 1;
+  Member<ScriptPromiseResolver> m_decodePromiseResolver;
 
   ReferrerPolicy m_referrerPolicy;
+
+  WTF::WeakPtrFactory<HTMLImageElement> m_weakPtrFactory;
 };
 
 }  // namespace blink
 
 #endif  // HTMLImageElement_h