Reduce copying of local data structures in GeometryMapper and PaintLayerClipper.

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

 // 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.
 
 #include "core/paint/PaintInvalidator.h"
 
 #include "core/editing/FrameSelection.h"
 #include "core/frame/FrameView.h"
 #include "core/frame/LocalFrame.h"
 #include "core/frame/Settings.h"
@@ skipping 164 matching lines @@
 
   LayoutPoint point;
   if (object != context.paintInvalidationContainer) {
     point.moveBy(object.paintOffset());
 
     const auto* containerTransform =
         context.paintInvalidationContainer->paintProperties()
             ->contentsProperties()
             ->transform();
     if (context.treeBuilderContext.current.transform != containerTransform) {
-      point = LayoutPoint(m_geometryMapper
-                              .sourceToDestinationRect(
-                                  FloatRect(FloatPoint(point), FloatSize()),
-                                  context.treeBuilderContext.current.transform,
-                                  containerTransform)
-                              .location());
+      FloatRect rect = FloatRect(FloatPoint(point), FloatSize());
+      m_geometryMapper.sourceToDestinationRect(
+          context.treeBuilderContext.current.transform, containerTransform,
+          rect);
+      point = LayoutPoint(rect.location());
     }
 
     // Convert the result to the container's contents space.
     point.moveBy(-context.paintInvalidationContainer->paintOffset());
   }
 
   if (context.paintInvalidationContainer->layer()->groupedMapping()) {
     FloatPoint floatPoint(point);
     PaintLayer::mapPointInPaintInvalidationContainerToBacking(
         *context.paintInvalidationContainer, floatPoint);
@@ skipping 290 matching lines @@
   }
 }
 
 void PaintInvalidator::processPendingDelayedPaintInvalidations() {
   for (auto target : m_pendingDelayedPaintInvalidations)
     target->getMutableForPainting().setShouldDoFullPaintInvalidation(
         PaintInvalidationDelayedFull);
 }
 
 }  // namespace blink