Use GeometryMapper in PaintLayerClipper.

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

 /*
  * Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011, 2012 Apple Inc. All rights
  * reserved.
  *
  * Portions are Copyright (C) 1998 Netscape Communications Corporation.
  *
  * Other contributors:
  *   Robert O'Callahan <roc+@cs.cmu.edu>
  *   David Baron <dbaron@fas.harvard.edu>
  *   Christian Biesinger <cbiesinger@web.de>
@@ skipping 2971 matching lines @@
   updateSelfPaintingLayer();
 
   updateTransform(oldStyle, layoutObject()->styleRef());
   updateFilters(oldStyle, layoutObject()->styleRef());
   updateClipPath(oldStyle, layoutObject()->styleRef());
 
   setNeedsCompositingInputsUpdate();
   layoutObject()->setNeedsPaintPropertyUpdate();
 }
 
+PaintLayerClipper PaintLayer::clipper() const {
+  GeometryMapper* geometryMapper = nullptr;
+  if (RuntimeEnabledFeatures::slimmingPaintInvalidationEnabled()) {
+    if (FrameView* frameView = m_layoutObject->document().view())
+      geometryMapper = frameView->geometryMapper();
+  }
+  return PaintLayerClipper(*this, geometryMapper);
+}
+
 bool PaintLayer::scrollsOverflow() const {
   if (PaintLayerScrollableArea* scrollableArea = this->getScrollableArea())
     return scrollableArea->scrollsOverflow();
 
   return false;
 }
 
 FilterOperations PaintLayer::addReflectionToFilterOperations(
     const ComputedStyle& style) const {
   FilterOperations filterOperations = style.filter();
@@ skipping 233 matching lines @@
 }
 
 void showLayerTree(const blink::LayoutObject* layoutObject) {
   if (!layoutObject) {
     LOG(INFO) << "Cannot showLayerTree. Root is (nil)";
     return;
   }
   showLayerTree(layoutObject->enclosingLayer());
 }
 #endif