Share duplicate inline stylesheets in quirks mode.

Source/core/dom/StyleEngine.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2011, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (C) 2008, 2009, 2011, 2012 Google Inc. All rights reserved.
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) Research In Motion Limited 2010-2011. All rights reserved.
@@ skipping 585 matching lines @@
         return false;
     return true;
 }
 
 PassRefPtrWillBeRawPtr<CSSStyleSheet> StyleEngine::createSheet(Element* e, const String& text, TextPosition startPosition, bool createdByParser)
 {
     RefPtrWillBeRawPtr<CSSStyleSheet> styleSheet = nullptr;
 
     e->document().styleEngine().addPendingSheet();
 
-    if (!e->document().inQuirksMode()) {
-        AtomicString textContent(text);
+    AtomicString textContent(text);
 
-        WillBeHeapHashMap<AtomicString, RawPtrWillBeMember<StyleSheetContents>>::AddResult result = m_textToSheetCache.add(textContent, nullptr);
-        if (result.isNewEntry || !result.storedValue->value) {
-            styleSheet = StyleEngine::parseSheet(e, text, startPosition, createdByParser);
-            if (result.isNewEntry && isCacheableForStyleElement(*styleSheet->contents())) {
-                result.storedValue->value = styleSheet->contents();
-                m_sheetToTextCache.add(styleSheet->contents(), textContent);
-            }
-        } else {
-            StyleSheetContents* contents = result.storedValue->value;
-            ASSERT(contents);
-            ASSERT(isCacheableForStyleElement(*contents));
-            ASSERT(contents->singleOwnerDocument() == e->document());
-            styleSheet = CSSStyleSheet::createInline(contents, e, startPosition);
+    WillBeHeapHashMap<AtomicString, RawPtrWillBeMember<StyleSheetContents>>::AddResult result = m_textToSheetCache.add(textContent, nullptr);
+    if (result.isNewEntry || !result.storedValue->value) {
+        styleSheet = StyleEngine::parseSheet(e, text, startPosition, createdByParser);
+        if (result.isNewEntry && isCacheableForStyleElement(*styleSheet->contents())) {
+            result.storedValue->value = styleSheet->contents();
+            m_sheetToTextCache.add(styleSheet->contents(), textContent);
         }
     } else {
-        // FIXME: currently we don't cache StyleSheetContents inQuirksMode.
-        styleSheet = StyleEngine::parseSheet(e, text, startPosition, createdByParser);
+        StyleSheetContents* contents = result.storedValue->value;
+        ASSERT(contents);
+        ASSERT(isCacheableForStyleElement(*contents));
+        ASSERT(contents->singleOwnerDocument() == e->document());
+        styleSheet = CSSStyleSheet::createInline(contents, e, startPosition);
     }
 
     ASSERT(styleSheet);
     styleSheet->setTitle(e->title());
     return styleSheet;
 }
 
 // TODO(timloh): Remove createdByParser
 PassRefPtrWillBeRawPtr<CSSStyleSheet> StyleEngine::parseSheet(Element* e, const String& text, TextPosition startPosition, bool createdByParser)
 {
@@ skipping 150 matching lines @@
     visitor->trace(m_dirtyTreeScopes);
     visitor->trace(m_activeTreeScopes);
     visitor->trace(m_fontSelector);
     visitor->trace(m_textToSheetCache);
     visitor->trace(m_sheetToTextCache);
 #endif
     CSSFontSelectorClient::trace(visitor);
 }
 
 }