Implements getImageAnimationPolicy() at ImageLoader.

Source/core/fetch/ImageResource.cpp

 /*
     Copyright (C) 1998 Lars Knoll (knoll@mpi-hd.mpg.de)
     Copyright (C) 2001 Dirk Mueller (mueller@kde.org)
     Copyright (C) 2002 Waldo Bastian (bastian@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
@@ skipping 85 matching lines @@
 {
     if (m_data && !m_image && !errorOccurred()) {
         createImage();
         m_image->setData(m_data, true);
     }
 
     ASSERT(c->resourceClientType() == ImageResourceClient::expectedType());
     if (m_image && !m_image->isNull())
         static_cast<ImageResourceClient*>(c)->imageChanged(this);
 
+    if (m_image && m_image->animationPolicy() == ImageAnimationPolicyInvalid)
+        updateImageAnimationPolicy();
     Resource::didAddClient(c);
 }
 
 void ImageResource::didRemoveClient(ResourceClient* c)
 {
     ASSERT(c);
     ASSERT(c->resourceClientType() == ImageResourceClient::expectedType());
     if (m_imageForContainerMap)
         m_imageForContainerMap->remove(static_cast<ImageResourceClient*>(c));
 
@@ skipping 310 matching lines @@
     if (!image || image != m_image)
         return;
     notifyObservers();
 }
 
 void ImageResource::updateImageAnimationPolicy()
 {
     if (!m_image)
         return;
 
-    ImageAnimationPolicy newPolicy = ImageAnimationPolicyAllowed;
+    ImageAnimationPolicy newPolicy = ImageAnimationPolicyInvalid;
     ResourceClientWalker<ImageResourceClient> w(m_clients);
     while (ImageResourceClient* c = w.next()) {
         if (c->getImageAnimationPolicy(this, newPolicy))
             break;
     }

[Mike West, 2015/05/01 22:43:23]

Nit: Can you `ASSERT(new_policy != ImageAnimationPolicyInvalid)` here?

 
     if (m_image->animationPolicy() != newPolicy) {
         m_image->resetAnimation();
         m_image->setAnimationPolicy(newPolicy);
     }
 }
 
 void ImageResource::changedInRect(const blink::Image* image, const IntRect& rect)
 {
     if (!image || image != m_image)
@@ skipping 58 matching lines @@
     if (node && isHTMLImageElement(node)) {
         const AtomicString& urlString = toHTMLImageElement(node)->imageSourceURL();
         KURL url = node->document().completeURL(urlString);
         imageForContainer->setURL(url);
     }
 
     return imageForContainer.get();
 }
 
 } // namespace blink