[SPInvalidation] Use GeometryMapper in PaintLayerClipper for paint.

third_party/WebKit/Source/platform/graphics/paint/GeometryMapper.h

 // 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.
 
 #ifndef GeometryMapper_h
 #define GeometryMapper_h
 
 #include "platform/graphics/paint/FloatClipRect.h"
 #include "platform/graphics/paint/PropertyTreeState.h"
 #include "platform/transforms/TransformationMatrix.h"
@@ skipping 35 matching lines @@
 //
 // NOTE: A GeometryMapper object is only valid for property trees that do not
 // change. If any mutation occurs, a new GeometryMapper object must be allocated
 // corresponding to the new state.
 //
 // Design document: http://bit.ly/28P4FDA
 //
 // TODO(chrishtr): take effect tree into account.
 class PLATFORM_EXPORT GeometryMapper {
  public:
-  GeometryMapper() {}
+  static std::unique_ptr<GeometryMapper> create() {
+    return WTF::wrapUnique(new GeometryMapper());
+  }
+
   // The runtime of m calls among localToAncestorVisualRect, localToAncestorRect
   // or ancestorToLocalRect with the same |ancestorState| parameter is
   // guaranteed to be O(n + m), where n is the number of transform and clip
   // nodes in their respective property trees.
 
   // If the clips and transforms of |sourceState| are equal to or descendants of
   // those of |destinationState|, returns the same value as
   // localToAncestorVisualRect. Otherwise, maps the input rect to the
   // transform state which is the lowest common ancestor of
   // |sourceState.transform| and |destinationState.transform|, then multiplies
@@ skipping 69 matching lines @@
       const PropertyTreeState& localTransformState,
       const PropertyTreeState& ancestorState);
 
   // Returns the lowest common ancestor in the paint property tree.
   template <typename NodeType>
   static PLATFORM_EXPORT const NodeType* lowestCommonAncestor(const NodeType*,
                                                               const NodeType*);
 
   void clearCache();
 
+ protected:
+  GeometryMapper() {}
+
  private:
   // The internal methods do the same things as their public counterparts, but
   // take an extra |success| parameter which indicates if the function is
   // successful on return. See comments of the public functions for failure
   // conditions.
 
   FloatClipRect sourceToDestinationVisualRectInternal(
       const FloatRect&,
       const PropertyTreeState& sourceState,
       const PropertyTreeState& destinationState,
@@ skipping 47 matching lines @@
       m_data;
 
   const TransformationMatrix m_identity;
 
   DISALLOW_COPY_AND_ASSIGN(GeometryMapper);
 };
 
 }  // namespace blink
 
 #endif  // GeometryMapper_h