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 05e3b212dc3c2a58cbd54bad508a09cee7a4b1b2..a0bad55e00f8f3dee1b5bc209c0af8dcff5a66ad 100644
--- a/Source/core/css/CSSStyleSheet.cpp
+++ b/Source/core/css/CSSStyleSheet.cpp
@@ -78,6 +78,13 @@ 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);
+    ASSERT(sheet->isCachable());
+    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);