Avoid parsing css text if there are identical inline style blocks.

Source/core/css/CSSStyleSheet.cpp

Index: Source/core/css/CSSStyleSheet.cpp
diff --git a/Source/core/css/CSSStyleSheet.cpp b/Source/core/css/CSSStyleSheet.cpp
index 433d3e4997fef9f8a72176e51c36d15240a6791a..33643fdc0e226c2a7743378130bed9821bcac06a 100644
--- a/Source/core/css/CSSStyleSheet.cpp
+++ b/Source/core/css/CSSStyleSheet.cpp
@@ -80,6 +80,12 @@ PassRefPtr<CSSStyleSheet> CSSStyleSheet::create(PassRefPtr<StyleSheetContents> s
     return adoptRef(new CSSStyleSheet(sheet, ownerNode, false, TextPosition::minimumPosition()));
 }
 
+PassRefPtr<CSSStyleSheet> CSSStyleSheet::createInline(PassRefPtr<StyleSheetContents> sheet, Node* ownerNode, const TextPosition& startPosition)
+{
+    ASSERT(sheet);
+    return adoptRef(new CSSStyleSheet(sheet, ownerNode, true, startPosition));
+}
+
 PassRefPtr<CSSStyleSheet> CSSStyleSheet::createInline(Node* ownerNode, const KURL& baseURL, const TextPosition& startPosition, const String& encoding)
 {
     CSSParserContext parserContext(ownerNode->document(), baseURL, encoding);