Share GeometryMapper cache between pre-paint and compositing.

third_party/WebKit/Source/core/paint/PrePaintTreeWalk.h

Index: third_party/WebKit/Source/core/paint/PrePaintTreeWalk.h
diff --git a/third_party/WebKit/Source/core/paint/PrePaintTreeWalk.h b/third_party/WebKit/Source/core/paint/PrePaintTreeWalk.h
index 603fad7e109f1b0a285118950b6940738d61432e..8f0f9171cd02acf43be0cbaab4294f41cb812416 100644
--- a/third_party/WebKit/Source/core/paint/PrePaintTreeWalk.h
+++ b/third_party/WebKit/Source/core/paint/PrePaintTreeWalk.h
@@ -11,6 +11,7 @@
 namespace blink {
 
 class FrameView;
+class GeometryMapper;
 class LayoutObject;
 struct PrePaintTreeWalkContext;
 
@@ -19,6 +20,8 @@ struct PrePaintTreeWalkContext;
 // perform actual actions.  It expects to be invoked in InPrePaint phase.
 class PrePaintTreeWalk {
  public:
+  PrePaintTreeWalk(GeometryMapper& geometryMapper)
+      : m_paintInvalidator(geometryMapper) {}
   void walk(FrameView& rootFrame);
 
  private: