Turn StyleSharing to 11.

sky/engine/core/dom/TreeScope.cpp

 /*
  * Copyright (C) 2011 Google Inc. All Rights Reserved.
  * Copyright (C) 2012 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 10 matching lines @@
  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #include "sky/engine/config.h"
 #include "sky/engine/core/dom/TreeScope.h"
 
 #include "gen/sky/core/HTMLNames.h"
+#include "sky/engine/core/css/StyleSheetList.h"
 #include "sky/engine/core/css/resolver/ScopedStyleResolver.h"
 #include "sky/engine/core/dom/ContainerNode.h"
 #include "sky/engine/core/dom/Document.h"
 #include "sky/engine/core/dom/Element.h"
 #include "sky/engine/core/dom/ElementTraversal.h"
 #include "sky/engine/core/dom/NodeRenderStyle.h"
 #include "sky/engine/core/dom/TreeScopeAdopter.h"
 #include "sky/engine/core/dom/shadow/ElementShadow.h"
 #include "sky/engine/core/dom/shadow/ShadowRoot.h"
 #include "sky/engine/core/editing/DOMSelection.h"
@@ skipping 372 matching lines @@
 {
     for (Element* element = ElementTraversal::firstWithin(rootNode()); element; element = ElementTraversal::next(*element)) {
         if (ShadowRoot* root = element->shadowRoot())
             root->setNeedsStyleRecalcForViewportUnits();
         RenderStyle* style = element->renderStyle();
         if (style && style->hasViewportUnits())
             element->setNeedsStyleRecalc(LocalStyleChange);
     }
 }
 
+bool TreeScope::hasSameStyles(TreeScope& other)
+{
+    if (this == &other)
+        return true;
+    const Vector<RefPtr<blink::CSSStyleSheet> >& list = document().styleEngine()->styleSheetsForStyleSheetList(*this);
+    const Vector<RefPtr<blink::CSSStyleSheet> >& otherList = document().styleEngine()->styleSheetsForStyleSheetList(other);
+
+    if (list.size() != otherList.size())
+        return false;
+
+    for (size_t i = 0; i < list.size(); i++) {
+        if (list[i]->contents() != otherList[i]->contents())
+            return false;
+    }
+
+    return true;
+}
+
 } // namespace blink