Fix overflow:overlay scrollbar width for paint.

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/LocalFrame.h"
 #include "core/layout/LayoutView.h"
 #include "core/paint/ClipPathClipper.h"
 #include "core/paint/FilterPainter.h"
@@ skipping 432 matching lines @@
       geometryMapperOption = PaintLayer::UseGeometryMapper;
 
     // TODO(trchen): We haven't decided how to handle visual fragmentation with
     // SPv2.  Related thread
     // https://groups.google.com/a/chromium.org/forum/#!topic/graphics-dev/81XuWFf-mxM
     if (fragmentPolicy == ForceSingleFragment ||
         RuntimeEnabledFeatures::slimmingPaintV2Enabled()) {
       paintLayerForFragments->appendSingleFragmentIgnoringPagination(
           layerFragments, localPaintingInfo.rootLayer,
           localPaintingInfo.paintDirtyRect, cacheSlot, geometryMapperOption,
-          IgnoreOverlayScrollbarSize, respectOverflowClip, &offsetFromRoot,
-          localPaintingInfo.subPixelAccumulation);
+          IgnorePlatformOverlayScrollbarSize, respectOverflowClip,
+          &offsetFromRoot, localPaintingInfo.subPixelAccumulation);
     } else if (isFixedPositionObjectInPagedMedia()) {
       PaintLayerFragments singleFragment;
       paintLayerForFragments->appendSingleFragmentIgnoringPagination(
           singleFragment, localPaintingInfo.rootLayer,
           localPaintingInfo.paintDirtyRect, cacheSlot, geometryMapperOption,
-          IgnoreOverlayScrollbarSize, respectOverflowClip, &offsetFromRoot,
-          localPaintingInfo.subPixelAccumulation);
+          IgnorePlatformOverlayScrollbarSize, respectOverflowClip,
+          &offsetFromRoot, localPaintingInfo.subPixelAccumulation);
       repeatFixedPositionObjectInPages(singleFragment[0], paintingInfo,
                                        layerFragments);
     } else {
       paintLayerForFragments->collectFragments(
           layerFragments, localPaintingInfo.rootLayer,
           localPaintingInfo.paintDirtyRect, cacheSlot, geometryMapperOption,
-          IgnoreOverlayScrollbarSize, respectOverflowClip, &offsetFromRoot,
-          localPaintingInfo.subPixelAccumulation);
+          IgnorePlatformOverlayScrollbarSize, respectOverflowClip,
+          &offsetFromRoot, localPaintingInfo.subPixelAccumulation);
     }
 
     if (paintFlags & PaintLayerPaintingAncestorClippingMaskPhase) {
       // Fragment offsets have been computed in the clipping container's
       // layer's coordinate system, but for the rest of painting we need
       // them in the layer coordinate. So move them and the foreground rect
       // that is also in the clipper's space.
       LayoutSize negativeOffset(-offsetToClipper.x(), -offsetToClipper.y());
       for (auto& fragment : layerFragments) {
         fragment.foregroundRect.move(negativeOffset);
@@ skipping 242 matching lines @@
     LayoutRect transformedExtent = PaintLayer::transparencyClipBox(
         &m_paintLayer, paginationLayer, PaintLayer::PaintingTransparencyClipBox,
         PaintLayer::RootOfTransparencyClipBox,
         paintingInfo.subPixelAccumulation, paintingInfo.getGlobalPaintFlags());
 
     // FIXME: we don't check if paginationLayer is within
     // paintingInfo.rootLayer
     // here.
     paginationLayer->collectFragments(
         layerFragments, paintingInfo.rootLayer, paintingInfo.paintDirtyRect,
-        cacheSlot, geometryMapperOption, IgnoreOverlayScrollbarSize,
+        cacheSlot, geometryMapperOption, IgnorePlatformOverlayScrollbarSize,
         respectOverflowClip, nullptr, paintingInfo.subPixelAccumulation,
         &transformedExtent);
   }
 
   Optional<DisplayItemCacheSkipper> cacheSkipper;
   if (layerFragments.size() > 1)
     cacheSkipper.emplace(context);
 
   ClipRect ancestorBackgroundClipRect;
   if (!RuntimeEnabledFeatures::slimmingPaintV2Enabled()) {
     if (parentLayer) {
       // Calculate the clip rectangle that the ancestors establish.
       ClipRectsContext clipRectsContext(
           paintingInfo.rootLayer,
           (paintFlags & PaintLayerUncachedClipRects) ? UncachedClipRects
                                                      : PaintingClipRects,
-          IgnoreOverlayScrollbarSize);
+          IgnorePlatformOverlayScrollbarSize);
       if (shouldRespectOverflowClip(paintFlags, m_paintLayer.layoutObject()) ==
           IgnoreOverflowClip)
         clipRectsContext.setIgnoreOverflowClip();
       m_paintLayer.clipper(geometryMapperOption)
           .calculateBackgroundClipRect(clipRectsContext,
                                        ancestorBackgroundClipRect);
     }
   }
 
   PaintResult result = FullyPainted;
@@ skipping 445 matching lines @@
           context, layoutObject, PaintPhaseClippingMask))
     return;
 
   IntRect snappedClipRect = pixelSnappedIntRect(clipRect.rect());
   LayoutObjectDrawingRecorder drawingRecorder(
       context, layoutObject, PaintPhaseClippingMask, snappedClipRect);
   context.fillRect(snappedClipRect, Color::black);
 }
 
 }  // namespace blink