Adding @keyframes rules only affects TreeScope plus host.

third_party/WebKit/Source/core/css/resolver/ScopedStyleResolver.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
  *     notice, this list of conditions and the following disclaimer in the
  *     documentation and/or other materials provided with the distribution.
  *
  * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND ANY
  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  * DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY
  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
  * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #include "core/css/resolver/ScopedStyleResolver.h"
 
 #include "core/HTMLNames.h"
+#include "core/animation/DocumentTimeline.h"
 #include "core/css/CSSFontSelector.h"
 #include "core/css/CSSStyleSheet.h"
 #include "core/css/FontFace.h"
 #include "core/css/PageRuleCollector.h"
 #include "core/css/RuleFeature.h"
 #include "core/css/StyleRule.h"
 #include "core/css/StyleSheetContents.h"
 #include "core/css/resolver/MatchRequest.h"
 #include "core/css/resolver/ViewportStyleResolver.h"
 #include "core/dom/Document.h"
+#include "core/dom/StyleChangeReason.h"
 #include "core/dom/StyleEngine.h"
 #include "core/dom/shadow/ElementShadow.h"
 #include "core/dom/shadow/ShadowRoot.h"
 #include "core/html/HTMLStyleElement.h"
 #include "core/svg/SVGStyleElement.h"
 
 namespace blink {
 
 ScopedStyleResolver* ScopedStyleResolver::parent() const
 {
@@ skipping 87 matching lines @@
         KeyframesRuleMap::iterator it = m_keyframesRuleMap.find(s.impl());
         if (it == m_keyframesRuleMap.end())
             m_keyframesRuleMap.set(s.impl(), rule);
         else if (it->value->isVendorPrefixed())
             m_keyframesRuleMap.set(s.impl(), rule);
     } else {
         m_keyframesRuleMap.set(s.impl(), rule);
     }
 }
 
+static Node& invalidationRootFor(const TreeScope& treeScope)
+{
+    if (treeScope.rootNode() == treeScope.document())
+        return treeScope.document();
+    return toShadowRoot(treeScope.rootNode()).host();
+}
+
+void ScopedStyleResolver::keyframesRulesAdded(const TreeScope& treeScope)
+{
+    // Called when @keyframes rules are about to be added/removed from a
+    // TreeScope. @keyframes rules may apply to animations on elements in the
+    // same TreeScope as the stylesheet, or the host element in the parent
+    // TreeScope if the TreeScope is a shadow tree.
+
+    ScopedStyleResolver* resolver = treeScope.scopedStyleResolver();
+    ScopedStyleResolver* parentResolver = treeScope.parentTreeScope() ? treeScope.parentTreeScope()->scopedStyleResolver() : nullptr;
+
+    bool hadUnresolvedKeyframes = false;
+    if (resolver && resolver->m_hasUnresolvedKeyframesRule) {
+        resolver->m_hasUnresolvedKeyframesRule = false;
+        hadUnresolvedKeyframes = true;
+    }
+    if (parentResolver && parentResolver->m_hasUnresolvedKeyframesRule) {
+        parentResolver->m_hasUnresolvedKeyframesRule = false;
+        hadUnresolvedKeyframes = true;
+    }
+
+    if (hadUnresolvedKeyframes) {
+        // If an animation ended up not being started because no @keyframes
+        // rules were found for the animation-name, we need to recalculate style
+        // for the elements in the scope, including its shadow host if
+        // applicable.
+        invalidationRootFor(treeScope).setNeedsStyleRecalc(SubtreeStyleChange, StyleChangeReasonForTracing::create(StyleChangeReason::StyleSheetChange));
+        return;
+    }
+
+    // If we have animations running, added/removed @keyframes may affect these.
+    treeScope.document().timeline().invalidateKeyframeEffects(treeScope);
+}
+
 void ScopedStyleResolver::collectMatchingAuthorRules(ElementRuleCollector& collector, CascadeOrder cascadeOrder)
 {
     for (size_t i = 0; i < m_authorStyleSheets.size(); ++i) {
         ASSERT(m_authorStyleSheets[i]->ownerNode());
         MatchRequest matchRequest(&m_authorStyleSheets[i]->contents()->ruleSet(), &m_scope->rootNode(), m_authorStyleSheets[i], i);
         collector.collectMatchingRules(matchRequest, cascadeOrder);
     }
 }
 
 void ScopedStyleResolver::collectMatchingShadowHostRules(ElementRuleCollector& collector, CascadeOrder cascadeOrder)
@@ skipping 74 matching lines @@
     m_treeBoundaryCrossingRuleSet->append(RuleSubSet::create(parentStyleSheet, sheetIndex, ruleSetForScope));
 }
 
 DEFINE_TRACE(ScopedStyleResolver::RuleSubSet)
 {
     visitor->trace(m_parentStyleSheet);
     visitor->trace(m_ruleSet);
 }
 
 } // namespace blink