Expose setting API to set ImageAnimationPolicy(Allowed, Once, None)

Source/core/fetch/ImageResourceClient.h

 /*
     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 ImageResourceClient_h
 #define ImageResourceClient_h
 
 #include "core/fetch/ResourceClient.h"
+#include "platform/graphics/ImageAnimationPolicy.h"
 
 namespace blink {
 
 class ImageResource;
 class IntRect;
 
 class ImageResourceClient : public ResourceClient {
 public:
     virtual ~ImageResourceClient() { }
     static ResourceClientType expectedType() { return ImageType; }
     virtual ResourceClientType resourceClientType() const override final { return expectedType(); }
 
     // 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 RenderImages would (assuming they have visibility: visible and their render tree isn't hidden
     // e.g., in the b/f cache or in a background tab).
     virtual bool willRenderImage(ImageResource*) { return false; }
+
+    // Called to get imageAnimation policy from settings
+    virtual bool getImageAnimationPolicy(ImageResource*, ImageAnimationPolicy&) { return false; }
 };
 
 }
 
 #endif