Make `getComputedStyle` return the correct style for collapsed <img> 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 96 matching lines @@
 
   bool canContainRangeEndPoint() const override { return false; }
 
   const AtomicString imageSourceURL() const override;
 
   HTMLFormElement* formOwner() const override;
   void formRemovedFromTree(const Node& formRoot);
   virtual void ensureCollapsedOrFallbackContent();
   virtual void ensureFallbackForGeneratedContent();
   virtual void ensurePrimaryContent();
+  bool isCollapsed() const;
 
   // CanvasImageSource implementation
   PassRefPtr<Image> getSourceImageForCanvas(SourceImageStatus*,
                                             AccelerationHint,
                                             SnapshotReason,
                                             const FloatSize&) const override;
   bool isSVGSource() const override;
   bool wouldTaintOrigin(SecurityOrigin*) const override;
   FloatSize elementSize(const FloatSize&) const override;
   FloatSize defaultDestinationSize(const FloatSize&) const override;
@@ skipping 53 matching lines @@
   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);
 
   void attachLayoutTree(const AttachContext& = AttachContext()) override;
-  bool layoutObjectIsNeeded(const ComputedStyle&) override;
   LayoutObject* createLayoutObject(const ComputedStyle&) override;
 
   bool canStartSelection() const override { return false; }
 
   bool isURLAttribute(const Attribute&) const override;
   bool hasLegalLinkAttribute(const QualifiedName&) const override;
   const QualifiedName& subResourceAttributeName() const override;
 
   bool draggable() const override;
 
@@ skipping 21 matching lines @@
   unsigned m_formWasSetByParser : 1;
   unsigned m_elementCreatedByParser : 1;
   unsigned m_isFallbackImage : 1;
 
   ReferrerPolicy m_referrerPolicy;
 };
 
 }  // namespace blink
 
 #endif  // HTMLImageElement_h