Reduce copying of local data structures in GeometryMapper and PaintLayerClipper.

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

Index: third_party/WebKit/Source/core/paint/PaintInvalidator.cpp
diff --git a/third_party/WebKit/Source/core/paint/PaintInvalidator.cpp b/third_party/WebKit/Source/core/paint/PaintInvalidator.cpp
index 54bb8dc00a85b2f0d1823554bdbaef2251a1dafa..1071a73dd00e4be4aa812e69ce62658d499aafc5 100644
--- a/third_party/WebKit/Source/core/paint/PaintInvalidator.cpp
+++ b/third_party/WebKit/Source/core/paint/PaintInvalidator.cpp
@@ -182,12 +182,11 @@ LayoutPoint PaintInvalidator::computeLocationInBacking(
             ->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.