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diff --git a/chromium/third_party/WebKit/Source/core/dom/TreeScopeStyleSheetCollection.cpp b/chromium/third_party/WebKit/Source/core/dom/TreeScopeStyleSheetCollection.cpp
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+++ b/chromium/third_party/WebKit/Source/core/dom/TreeScopeStyleSheetCollection.cpp
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+/*
+ * 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, 2010, 2012 Apple Inc. All rights reserved.
+ * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
+ * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
+ * Copyright (C) 2013 Google Inc. All rights reserved.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public License
+ * along with this library; see the file COPYING.LIB.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#include "config.h"
+#include "core/dom/TreeScopeStyleSheetCollection.h"
+
+#include "core/css/CSSStyleSheet.h"
+#include "core/css/StyleRuleImport.h"
+#include "core/css/StyleSheetContents.h"
+#include "core/css/invalidation/StyleSheetInvalidationAnalysis.h"
+#include "core/css/resolver/StyleResolver.h"
+#include "core/dom/Element.h"
+#include "core/dom/StyleEngine.h"
+#include "core/html/HTMLLinkElement.h"
+#include "core/html/HTMLStyleElement.h"
+
+namespace WebCore {
+
+TreeScopeStyleSheetCollection::TreeScopeStyleSheetCollection(TreeScope& treeScope)
+    : m_treeScope(treeScope)
+    , m_hadActiveLoadingStylesheet(false)
+    , m_usesRemUnits(false)
+{
+}
+
+void TreeScopeStyleSheetCollection::addStyleSheetCandidateNode(Node* node, bool createdByParser)
+{
+    if (!node->inDocument())
+        return;
+
+    // Until the <body> exists, we have no choice but to compare document positions,
+    // since styles outside of the body and head continue to be shunted into the head
+    // (and thus can shift to end up before dynamically added DOM content that is also
+    // outside the body).
+    if (createdByParser && document().body())
+        m_styleSheetCandidateNodes.parserAdd(node);
+    else
+        m_styleSheetCandidateNodes.add(node);
+
+    if (!isHTMLStyleElement(*node))
+        return;
+
+    ContainerNode* scopingNode = toHTMLStyleElement(*node).scopingNode();
+    if (!isTreeScopeRoot(scopingNode))
+        m_scopingNodesForStyleScoped.add(scopingNode);
+}
+
+void TreeScopeStyleSheetCollection::removeStyleSheetCandidateNode(Node* node, ContainerNode* scopingNode)
+{
+    m_styleSheetCandidateNodes.remove(node);
+
+    if (!isTreeScopeRoot(scopingNode))
+        m_scopingNodesForStyleScoped.remove(scopingNode);
+}
+
+TreeScopeStyleSheetCollection::StyleResolverUpdateType TreeScopeStyleSheetCollection::compareStyleSheets(const WillBeHeapVector<RefPtrWillBeMember<CSSStyleSheet> >& oldStyleSheets, const WillBeHeapVector<RefPtrWillBeMember<CSSStyleSheet> >& newStylesheets, WillBeHeapVector<RawPtrWillBeMember<StyleSheetContents> >& addedSheets)
+{
+    unsigned newStyleSheetCount = newStylesheets.size();
+    unsigned oldStyleSheetCount = oldStyleSheets.size();
+    ASSERT(newStyleSheetCount >= oldStyleSheetCount);
+
+    if (!newStyleSheetCount)
+        return Reconstruct;
+
+    unsigned newIndex = 0;
+    for (unsigned oldIndex = 0; oldIndex < oldStyleSheetCount; ++oldIndex) {
+        while (oldStyleSheets[oldIndex] != newStylesheets[newIndex]) {
+            addedSheets.append(newStylesheets[newIndex]->contents());
+            if (++newIndex == newStyleSheetCount)
+                return Reconstruct;
+        }
+        if (++newIndex == newStyleSheetCount)
+            return Reconstruct;
+    }
+    bool hasInsertions = !addedSheets.isEmpty();
+    while (newIndex < newStyleSheetCount) {
+        addedSheets.append(newStylesheets[newIndex]->contents());
+        ++newIndex;
+    }
+    // If all new sheets were added at the end of the list we can just add them to existing StyleResolver.
+    // If there were insertions we need to re-add all the stylesheets so rules are ordered correctly.
+    return hasInsertions ? Reset : Additive;
+}
+
+bool TreeScopeStyleSheetCollection::activeLoadingStyleSheetLoaded(const WillBeHeapVector<RefPtrWillBeMember<CSSStyleSheet> >& newStyleSheets)
+{
+    // StyleSheets of <style> elements that @import stylesheets are active but loading. We need to trigger a full recalc when such loads are done.
+    bool hasActiveLoadingStylesheet = false;
+    unsigned newStylesheetCount = newStyleSheets.size();
+    for (unsigned i = 0; i < newStylesheetCount; ++i) {
+        if (newStyleSheets[i]->isLoading())
+            hasActiveLoadingStylesheet = true;
+    }
+    if (m_hadActiveLoadingStylesheet && !hasActiveLoadingStylesheet) {
+        m_hadActiveLoadingStylesheet = false;
+        return true;
+    }
+    m_hadActiveLoadingStylesheet = hasActiveLoadingStylesheet;
+    return false;
+}
+
+static bool findFontFaceRulesFromStyleSheetContents(const WillBeHeapVector<RawPtrWillBeMember<StyleSheetContents> >& sheets, WillBeHeapVector<RawPtrWillBeMember<const StyleRuleFontFace> >& fontFaceRules)
+{
+    bool hasFontFaceRule = false;
+
+    for (unsigned i = 0; i < sheets.size(); ++i) {
+        ASSERT(sheets[i]);
+        if (sheets[i]->hasFontFaceRule()) {
+            // FIXME: We don't need this for styles in shadow tree.
+            sheets[i]->findFontFaceRules(fontFaceRules);
+            hasFontFaceRule = true;
+        }
+    }
+    return hasFontFaceRule;
+}
+
+void TreeScopeStyleSheetCollection::analyzeStyleSheetChange(StyleResolverUpdateMode updateMode, const StyleSheetCollection& newCollection, StyleSheetChange& change)
+{
+    if (activeLoadingStyleSheetLoaded(newCollection.activeAuthorStyleSheets()))
+        return;
+
+    if (updateMode != AnalyzedStyleUpdate)
+        return;
+
+    // Find out which stylesheets are new.
+    WillBeHeapVector<RawPtrWillBeMember<StyleSheetContents> > addedSheets;
+    if (m_activeAuthorStyleSheets.size() <= newCollection.activeAuthorStyleSheets().size()) {
+        change.styleResolverUpdateType = compareStyleSheets(m_activeAuthorStyleSheets, newCollection.activeAuthorStyleSheets(), addedSheets);
+    } else {
+        StyleResolverUpdateType updateType = compareStyleSheets(newCollection.activeAuthorStyleSheets(), m_activeAuthorStyleSheets, addedSheets);
+        if (updateType != Additive) {
+            change.styleResolverUpdateType = updateType;
+        } else {
+            change.styleResolverUpdateType = Reset;
+            // If @font-face is removed, needs full style recalc.
+            if (findFontFaceRulesFromStyleSheetContents(addedSheets, change.fontFaceRulesToRemove))
+                return;
+        }
+    }
+
+    // FIXME: If styleResolverUpdateType is Reconstruct, we should return early here since
+    // we need to recalc the whole document. It's wrong to use StyleSheetInvalidationAnalysis since
+    // it only looks at the addedSheets.
+
+    // No point in doing the analysis work if we're just going to recalc the whole document anyways.
+    // This needs to be done after the compareStyleSheets calls above to ensure we don't throw away
+    // the StyleResolver if we don't need to.
+    if (document().hasPendingForcedStyleRecalc())
+        return;
+
+    // If we are already parsing the body and so may have significant amount of elements, put some effort into trying to avoid style recalcs.
+    if (!document().body() || document().hasNodesWithPlaceholderStyle())
+        return;
+    StyleSheetInvalidationAnalysis invalidationAnalysis(addedSheets);
+    if (invalidationAnalysis.dirtiesAllStyle())
+        return;
+    invalidationAnalysis.invalidateStyle(document());
+    change.requiresFullStyleRecalc = false;
+    return;
+}
+
+void TreeScopeStyleSheetCollection::clearMediaQueryRuleSetStyleSheets()
+{
+    for (size_t i = 0; i < m_activeAuthorStyleSheets.size(); ++i) {
+        StyleSheetContents* contents = m_activeAuthorStyleSheets[i]->contents();
+        if (contents->hasMediaQueries())
+            contents->clearRuleSet();
+    }
+}
+
+void TreeScopeStyleSheetCollection::enableExitTransitionStylesheets()
+{
+    DocumentOrderedList::iterator begin = m_styleSheetCandidateNodes.begin();
+    DocumentOrderedList::iterator end = m_styleSheetCandidateNodes.end();
+    for (DocumentOrderedList::iterator it = begin; it != end; ++it) {
+        Node* node = *it;
+        if (isHTMLLinkElement(*node))
+            toHTMLLinkElement(node)->enableIfExitTransitionStyle();
+    }
+}
+
+void TreeScopeStyleSheetCollection::resetAllRuleSetsInTreeScope(StyleResolver* styleResolver)
+{
+    // FIXME: If many web developers use style scoped, implement reset RuleSets in per-scoping node manner.
+    if (DocumentOrderedList* styleScopedScopingNodes = scopingNodesForStyleScoped()) {
+        for (DocumentOrderedList::iterator it = styleScopedScopingNodes->begin(); it != styleScopedScopingNodes->end(); ++it)
+            styleResolver->resetAuthorStyle(toContainerNode(*it));
+    }
+    if (ListHashSet<Node*, 4>* removedNodes = scopingNodesRemoved()) {
+        for (ListHashSet<Node*, 4>::iterator it = removedNodes->begin(); it != removedNodes->end(); ++it)
+            styleResolver->resetAuthorStyle(toContainerNode(*it));
+    }
+    styleResolver->resetAuthorStyle(toContainerNode(&m_treeScope.rootNode()));
+}
+
+static bool styleSheetsUseRemUnits(const WillBeHeapVector<RefPtrWillBeMember<CSSStyleSheet> >& sheets)
+{
+    for (unsigned i = 0; i < sheets.size(); ++i) {
+        if (sheets[i]->contents()->usesRemUnits())
+            return true;
+    }
+    return false;
+}
+
+void TreeScopeStyleSheetCollection::updateUsesRemUnits()
+{
+    m_usesRemUnits = styleSheetsUseRemUnits(m_activeAuthorStyleSheets);
+}
+
+}