[Layout API] Use Document::layoutViewItem() in ViewportStyleResolver

third_party/WebKit/Source/core/layout/api/LayoutViewItem.h

 
 // Copyright 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 LayoutViewItem_h
 #define LayoutViewItem_h
 
 #include "core/layout/LayoutView.h"
 #include "core/layout/api/LayoutBlockItem.h"
@@ skipping 110 matching lines @@
     int viewHeight(IncludeScrollbarsInRect scrollbarInclusion = ExcludeScrollbars) const
     {
         return toView()->viewHeight(scrollbarInclusion);
     }
 
     int viewWidth(IncludeScrollbarsInRect scrollbarInclusion = ExcludeScrollbars) const
     {
         return toView()->viewWidth(scrollbarInclusion);
     }
 
+    FloatSize viewportSizeForViewportUnits() const
+    {
+        return toView()->viewportSizeForViewportUnits();
+    }
+
 private:
     LayoutView* toView() { return toLayoutView(layoutObject()); }
     const LayoutView* toView() const { return toLayoutView(layoutObject()); }
 };
 
 } // namespace blink
 
 #endif // LayoutViewItem_h