Pause SVG animations when the document is detached.

Source/core/css/resolver/StyleResolver.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 2004-2005 Allan Sandfeld Jensen (kde@carewolf.com)
  * Copyright (C) 2006, 2007 Nicholas Shanks (webkit@nickshanks.com)
  * Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013 Apple Inc. All rights reserved.
  * Copyright (C) 2007 Alexey Proskuryakov <ap@webkit.org>
  * Copyright (C) 2007, 2008 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (c) 2011, Code Aurora Forum. All rights reserved.
  * Copyright (C) Research In Motion Limited 2011. All rights reserved.
@@ skipping 594 matching lines @@
 static inline void resetDirectionAndWritingModeOnDocument(Document* document)
 {
     document->setDirectionSetOnDocumentElement(false);
     document->setWritingModeSetOnDocumentElement(false);
 }
 
 
 PassRefPtr<RenderStyle> StyleResolver::styleForElement(Element* element, RenderStyle* defaultParent, StyleSharingBehavior sharingBehavior,
     RuleMatchingBehavior matchingBehavior, RenderRegion* regionForStyling)
 {
-    // FIXME: We should only ever resolve style on documents which are
-    // in a frame. Unfortunately SVG Animation violates this: crbug.com/260966
-    // ASSERT(document()->frame());
-    // ASSERT(documentSettings());
+    ASSERT(document()->frame());
+    ASSERT(documentSettings());
 
     // Once an element has a renderer, we don't try to destroy it, since otherwise the renderer
     // will vanish if a style recalc happens during loading.
     if (sharingBehavior == AllowStyleSharing && !element->document()->haveStylesheetsLoaded() && !element->renderer()) {
         if (!s_styleNotYetAvailable) {
             s_styleNotYetAvailable = RenderStyle::create().leakRef();
             s_styleNotYetAvailable->setDisplay(NONE);
             s_styleNotYetAvailable->font().update(m_fontSelector);
         }
         element->document()->setHasNodesWithPlaceholderStyle();
@@ skipping 299 matching lines @@
 
     document()->didAccessStyleResolver();
 
     // Now return the style.
     return state.takeStyle();
 }
 
 PassRefPtr<RenderStyle> StyleResolver::defaultStyleForElement()
 {
     m_state.setStyle(RenderStyle::create());
-    // FIXME: This should be removed once SVG Animations are fixed
-    // to not resolve style on documents outside a frame: crbug.com/260966
-    if (!documentSettings()) {
-        m_state.style()->font().update(0);
-        return m_state.takeStyle();
-    }
     m_state.fontBuilder().initForStyleResolve(document(), m_state.style(), m_state.useSVGZoomRules());
     m_state.style()->setLineHeight(RenderStyle::initialLineHeight());
     m_state.setLineHeightValue(0);
     m_state.fontBuilder().setInitial(m_state.style()->effectiveZoom());
     m_state.style()->font().update(fontSelector());
     return m_state.takeStyle();
 }
 
 PassRefPtr<RenderStyle> StyleResolver::styleForText(Text* textNode)
 {
@@ skipping 526 matching lines @@
     info.addMember(m_state, "state");
 
     // FIXME: move this to a place where it would be called only once?
     info.addMember(CSSDefaultStyleSheets::defaultStyle, "defaultStyle");
     info.addMember(CSSDefaultStyleSheets::defaultQuirksStyle, "defaultQuirksStyle");
     info.addMember(CSSDefaultStyleSheets::defaultPrintStyle, "defaultPrintStyle");
     info.addMember(CSSDefaultStyleSheets::defaultViewSourceStyle, "defaultViewSourceStyle");
 }
 
 } // namespace WebCore