Add a Physical Web omnibox autocomplete provider

third_party/WebKit/Source/core/dom/StyleEngineContext.h

 // Copyright (c) 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef StyleEngineContext_h
 #define StyleEngineContext_h
 
 #include "core/dom/Document.h"
 
 namespace blink {
 
-class StyleEngineContext {
+class CORE_EXPORT StyleEngineContext {
 public:
-    StyleEngineContext() : m_addedPendingSheetBeforeBody(false) {}
+    StyleEngineContext();
     ~StyleEngineContext() {}
     bool addedPendingSheetBeforeBody() const { return m_addedPendingSheetBeforeBody; }
-    void addingPendingSheet(const Document& document) { m_addedPendingSheetBeforeBody = m_addedPendingSheetBeforeBody || !document.body(); }
+    void addingPendingSheet(const Document&);
 private:
     bool m_addedPendingSheetBeforeBody : 1;
 };
 
 } // namespace blink
 
 #endif