Make CSSValuePool thread local to ensure correct parsing in colors on workers

third_party/WebKit/Source/core/css/parser/CSSParser.cpp

Index: third_party/WebKit/Source/core/css/parser/CSSParser.cpp
diff --git a/third_party/WebKit/Source/core/css/parser/CSSParser.cpp b/third_party/WebKit/Source/core/css/parser/CSSParser.cpp
index 075226045b4d2fee237b3a77fe402e4f3fee58a9..1f75bbf3e5ad33097f058395b8cfb06397ee3a7b 100644
--- a/third_party/WebKit/Source/core/css/parser/CSSParser.cpp
+++ b/third_party/WebKit/Source/core/css/parser/CSSParser.cpp
@@ -132,7 +132,7 @@ bool CSSParser::parseSupportsCondition(const String& condition)
     return CSSSupportsParser::supportsCondition(scope.tokenRange(), parser) == CSSSupportsParser::Supported;
 }
 
-bool CSSParser::parseColor(Color& color, const String& string, bool strict)
+bool CSSParser::parseColor(Color& color, const String& string, CSSValuePool* localCssValuePool, bool strict)
 {
     if (string.isEmpty())
         return false;
@@ -145,7 +145,13 @@ bool CSSParser::parseColor(Color& color, const String& string, bool strict)
         return true;
     }
 
-    RawPtr<CSSValue> value = CSSParserFastPaths::parseColor(string, strict ? HTMLStandardMode : HTMLQuirksMode);
+    RawPtr<CSSValue> value;
+    if (!localCssValuePool) {
+        value = CSSParserFastPaths::parseColor(string, strict ? HTMLStandardMode : HTMLQuirksMode, &cssValuePool());
+    } else {
+        value = CSSParserFastPaths::parseColor(string, strict ? HTMLStandardMode : HTMLQuirksMode, localCssValuePool);
+    }
+
     // TODO(timloh): Why is this always strict mode?
     if (!value)
         value = parseSingleValue(CSSPropertyColor, string, strictCSSParserContext());