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diff --git a/third_party/WebKit/Source/core/fetch/ImageResourceObserver.h b/third_party/WebKit/Source/core/fetch/ImageResourceObserver.h
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+/*
+    Copyright (C) 1998 Lars Knoll (knoll@mpi-hd.mpg.de)
+    Copyright (C) 2001 Dirk Mueller <mueller@kde.org>
+    Copyright (C) 2006 Samuel Weinig (sam.weinig@gmail.com)
+    Copyright (C) 2004, 2005, 2006, 2007 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.
+
+    This library is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+    Library General Public License for more details.
+
+    You should have received a copy of the GNU Library General Public License
+    along with this library; see the file COPYING.LIB.  If not, write to
+    the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+    Boston, MA 02110-1301, USA.
+*/
+
+#ifndef ImageResourceObserver_h
+#define ImageResourceObserver_h
+
+#include "core/CoreExport.h"
+#include "platform/graphics/ImageAnimationPolicy.h"
+#include "platform/network/ResourceLoadPriority.h"
+#include "wtf/Forward.h"
+
+namespace blink {
+
+class ImageResource;
+class IntRect;
+
+class CORE_EXPORT ImageResourceObserver {
+public:
+    virtual ~ImageResourceObserver() {}
+
+    // Called whenever a frame of an image changes, either because we got more data from the network or
+    // because we are animating. If not null, the IntRect is the changed rect of the image.
+    virtual void imageChanged(ImageResource*, const IntRect* = 0) { }
+
+    // Called to find out if this client wants to actually display the image. Used to tell when we
+    // can halt animation. Content nodes that hold image refs for example would not render the image,
+    // but LayoutImages would (assuming they have visibility: visible and their layout tree isn't hidden
+    // e.g., in the b/f cache or in a background tab).
+    virtual bool willRenderImage() { return false; }
+
+    // Called to get imageAnimation policy from settings
+    virtual bool getImageAnimationPolicy(ImageAnimationPolicy&) { return false; }
+
+    virtual ResourcePriority computeResourcePriority() const { return ResourcePriority(); }
+
+    // Name for debugging, e.g. shown in memory-infra.
+    virtual String debugName() const = 0;
+
+    static bool isExpectedType(ImageResourceObserver*) { return true; }
+};
+
+} // namespace blink
+
+#endif