[SPv2] Add CSS mask support

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 1117 matching lines @@
 
 void PaintLayerPainter::paintMaskForFragments(
     const PaintLayerFragments& layerFragments,
     GraphicsContext& context,
     const PaintLayerPaintingInfo& localPaintingInfo,
     PaintLayerFlags paintFlags) {
   Optional<DisplayItemCacheSkipper> cacheSkipper;
   if (layerFragments.size() > 1)
     cacheSkipper.emplace(context);
 
+  Optional<ScopedPaintChunkProperties> scopedPaintChunkProperties;
+  if (RuntimeEnabledFeatures::slimmingPaintV2Enabled()) {
+    const auto* objectPaintProperties =
+        m_paintLayer.layoutObject()->paintProperties();
+    DCHECK(objectPaintProperties && objectPaintProperties->maskContent());
+    PaintChunkProperties properties(
+        context.getPaintController().currentPaintChunkProperties());
+    properties.propertyTreeState.setEffect(
+        objectPaintProperties->maskContent());
+    scopedPaintChunkProperties.emplace(context.getPaintController(),
+                                       m_paintLayer, properties);
+  }
+
   for (auto& fragment : layerFragments)
     paintFragmentWithPhase(PaintPhaseMask, fragment, context,
                            fragment.backgroundRect, localPaintingInfo,
                            paintFlags, HasNotClipped);
 }
 
 void PaintLayerPainter::paintChildClippingMaskForFragments(
     const PaintLayerFragments& layerFragments,
     GraphicsContext& context,
     const PaintLayerPaintingInfo& localPaintingInfo,
@@ skipping 30 matching lines @@
           context, layoutObject, PaintPhaseClippingMask))
     return;
 
   IntRect snappedClipRect = pixelSnappedIntRect(clipRect.rect());
   LayoutObjectDrawingRecorder drawingRecorder(
       context, layoutObject, PaintPhaseClippingMask, snappedClipRect);
   context.fillRect(snappedClipRect, Color::black);
 }
 
 }  // namespace blink