Share GeometryMapper cache between pre-paint and compositing.

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/geometry/FloatRect.h"
 #include "platform/graphics/paint/PropertyTreeState.h"
 #include "platform/transforms/TransformationMatrix.h"
@@ skipping 114 matching lines @@
   // |ancestorState|. See above for the definition of "clip visual rect".
   FloatRect localToAncestorClipRect(
       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();
+
  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.
 
   FloatRect sourceToDestinationVisualRectInternal(
       const FloatRect&,
       const PropertyTreeState& sourceState,
       const PropertyTreeState& destinationState,
@@ skipping 34 matching lines @@
       m_data;
 
   const TransformationMatrix m_identity;
 
   DISALLOW_COPY_AND_ASSIGN(GeometryMapper);
 };
 
 }  // namespace blink
 
 #endif  // GeometryMapper_h