Properties labelled !important must be ignored in keyframes

Source/core/css/parser/CSSParserImpl.cpp

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "config.h"
 #include "core/css/parser/CSSParserImpl.h"
 
 #include "core/css/CSSKeyframesRule.h"
 #include "core/css/CSSStyleSheet.h"
 #include "core/css/StylePropertySet.h"
@@ skipping 643 matching lines @@
 
 void CSSParserImpl::consumeDeclaration(CSSParserTokenRange range, StyleRule::Type ruleType)
 {
     CSSParserTokenRange rangeCopy = range; // For inspector callbacks
 
     ASSERT(range.peek().type() == IdentToken);
     CSSPropertyID unresolvedProperty = range.consumeIncludingWhitespace().parseAsUnresolvedCSSPropertyID();
     if (range.consume().type() != ColonToken)
         return; // Parse error
 
-    // FIXME: We shouldn't allow !important in @keyframes or @font-face
     bool important = false;
     const CSSParserToken* declarationValueEnd = range.end();
     const CSSParserToken* last = range.end() - 1;
     while (last->type() == WhitespaceToken)
         --last;
     if (last->type() == IdentToken && last->valueEqualsIgnoringCase("important")) {
         --last;
         while (last->type() == WhitespaceToken)
             --last;
         if (last->type() == DelimiterToken && last->delimiter() == '!') {
             important = true;
             declarationValueEnd = last;
         }
     }
 
+    if (important && (ruleType == StyleRule::FontFace || ruleType == StyleRule::Keyframes))
+        return;
+
     if (m_observerWrapper && ruleType == StyleRule::Style) {
         size_t propertiesCount = m_parsedProperties.size();
         if (unresolvedProperty != CSSPropertyInvalid)
             consumeDeclarationValue(range.makeSubRange(&range.peek(), declarationValueEnd), unresolvedProperty, important, ruleType);
         m_observerWrapper->observer().startProperty(m_observerWrapper->startOffset(rangeCopy));
         m_observerWrapper->observer().endProperty(important,
             m_parsedProperties.size() != propertiesCount,
             m_observerWrapper->endOffset(rangeCopy), NoCSSError);
         return;
     }
@@ skipping 30 matching lines @@
         else
             return nullptr; // Parser error, invalid value in keyframe selector
         if (range.atEnd())
             return result.release();
         if (range.consume().type() != CommaToken)
             return nullptr; // Parser error
     }
 }
 
 } // namespace blink