Disallow cast/implicit conversion from LayoutUnit to int/unsigned

third_party/WebKit/Source/core/paint/PaintLayerPainter.cpp

 // Copyright 2014 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.
 
 #include "core/paint/PaintLayerPainter.h"
 
 #include "core/frame/FrameView.h"
 #include "core/frame/Settings.h"
 #include "core/layout/LayoutBlock.h"
 #include "core/layout/LayoutView.h"
@@ skipping 483 matching lines @@
     if (isFixedPosObjectInPagedMedia && view->isHorizontalWritingMode()) {
         // "For paged media, boxes with fixed positions are repeated on every page."
         // - https://www.w3.org/TR/2011/REC-CSS2-20110607/visuren.html#fixed-positioning
         unsigned pages = ceilf(view->documentRect().height() / view->pageLogicalHeight());
         LayoutPoint paginationOffset;
         for (unsigned i = 0; i < pages; i++) {
             PaintLayerFragment fragment;
             fragment.backgroundRect = paintingInfo.paintDirtyRect;
             fragment.paginationOffset = paginationOffset;
             fragments.append(fragment);
-            paginationOffset += LayoutPoint(0, view->pageLogicalHeight());
+            // TODO(crbug.com/638981): Is the conversion to int intentional?
+            paginationOffset += LayoutPoint(0, view->pageLogicalHeight().toInt());
         }
     } else if (paginationLayer) {
         // FIXME: This is a mess. Look closely at this code and the code in Layer and fix any
         // issues in it & refactor to make it obvious from code structure what it does and that it's
         // correct.
         ClipRectsCacheSlot cacheSlot = (paintFlags & PaintLayerUncachedClipRects) ? UncachedClipRects : PaintingClipRects;
         ShouldRespectOverflowClipType respectOverflowClip = shouldRespectOverflowClip(paintFlags, m_paintLayer.layoutObject());
         // Calculate the transformed bounding box in the current coordinate space, to figure out
         // which fragmentainers (e.g. columns) we need to visit.
         LayoutRect transformedExtent = PaintLayer::transparencyClipBox(&m_paintLayer, paginationLayer, PaintLayer::PaintingTransparencyClipBox, PaintLayer::RootOfTransparencyClipBox, paintingInfo.subPixelAccumulation, paintingInfo.getGlobalPaintFlags());
@@ skipping 301 matching lines @@
     if (!m_paintLayer.containsDirtyOverlayScrollbars())
         return;
 
     PaintLayerPaintingInfo paintingInfo(&m_paintLayer, LayoutRect(enclosingIntRect(damageRect)), paintFlags, LayoutSize());
     paintLayer(context, paintingInfo, PaintLayerPaintingOverlayScrollbars);
 
     m_paintLayer.setContainsDirtyOverlayScrollbars(false);
 }
 
 } // namespace blink