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diff --git a/chromium/third_party/WebKit/Source/core/dom/custom/CustomElementMicrotaskImportStep.h b/chromium/third_party/WebKit/Source/core/dom/custom/CustomElementMicrotaskImportStep.h
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+/*
+ * Copyright (C) 2013 Google 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
+ *    notice, this list of conditions and the following disclaimer
+ *    in the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name of Google Inc. nor the names of its contributors
+ *    may be used to endorse or promote products derived from this
+ *    software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR 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.
+ */
+
+#ifndef CustomElementMicrotaskImportStep_h
+#define CustomElementMicrotaskImportStep_h
+
+#include "core/dom/custom/CustomElementMicrotaskStep.h"
+#include "platform/heap/Handle.h"
+#include "wtf/Noncopyable.h"
+#include "wtf/PassOwnPtr.h"
+#include "wtf/PassRefPtr.h"
+#include "wtf/RefPtr.h"
+#include "wtf/WeakPtr.h"
+
+namespace WebCore {
+
+class CustomElementSyncMicrotaskQueue;
+class HTMLImportChild;
+
+// Processes the Custom Elements in an HTML Import. This is a
+// composite step which processes the Custom Elements created by
+// parsing the import, and its sub-imports.
+//
+// This step blocks further Custom Element microtask processing if its
+// import isn't "ready" (finished parsing and running script.)
+class CustomElementMicrotaskImportStep : public CustomElementMicrotaskStep {
+    WTF_MAKE_NONCOPYABLE(CustomElementMicrotaskImportStep);
+public:
+    static PassOwnPtrWillBeRawPtr<CustomElementMicrotaskImportStep> create(HTMLImportChild*);
+    virtual ~CustomElementMicrotaskImportStep();
+
+    // API for HTML Imports
+    void parentWasChanged();
+    void importDidFinishLoading();
+#if !ENABLE(OILPAN)
+    WeakPtr<CustomElementMicrotaskImportStep> weakPtr() { return m_weakFactory.createWeakPtr(); }
+#endif
+
+    virtual void trace(Visitor*) OVERRIDE;
+
+private:
+    explicit CustomElementMicrotaskImportStep(HTMLImportChild*);
+
+    void didUpgradeAllCustomElements();
+    bool shouldWaitForImport() const;
+
+    // CustomElementMicrotaskStep
+    virtual Result process() OVERRIDE FINAL;
+
+#if !defined(NDEBUG)
+    virtual void show(unsigned indent) OVERRIDE;
+#endif
+    WeakPtrWillBeWeakMember<HTMLImportChild> m_import;
+#if !ENABLE(OILPAN)
+    WeakPtrFactory<CustomElementMicrotaskImportStep> m_weakFactory;
+#endif
+    RefPtrWillBeMember<CustomElementSyncMicrotaskQueue> m_queue;
+};
+
+}
+
+#endif // CustomElementMicrotaskImportStep_h