add backdrop option to SaveLayerRec

include/private/SkRecords.h

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkRecords_DEFINED
 #define SkRecords_DEFINED
 
 #include "SkCanvas.h"
 #include "SkDrawable.h"
+#include "SkImageFilter.h"
 #include "SkMatrix.h"
 #include "SkPath.h"
 #include "SkPicture.h"
 #include "SkRect.h"
 #include "SkRRect.h"
 #include "SkRSXform.h"
 #include "SkTextBlob.h"
 
 namespace SkRecords {
 
@@ skipping 167 matching lines @@
 
 RECORD(NoOp, 0);
 RECORD(Restore, 0,
         SkIRect devBounds;
         TypedMatrix matrix);
 RECORD(Save, 0);
 
 RECORD(SaveLayer, 0,
        Optional<SkRect> bounds;
        Optional<SkPaint> paint;
+       RefBox<const SkImageFilter> backdrop;
        SkCanvas::SaveLayerFlags saveLayerFlags);
 
 RECORD(SetMatrix, 0,
         TypedMatrix matrix);
 RECORD(Concat, 0,
         TypedMatrix matrix);
 
 struct RegionOpAndAA {
     RegionOpAndAA() {}
     RegionOpAndAA(SkRegion::Op op, bool aa) : op(op), aa(aa) {}
@@ skipping 145 matching lines @@
         PODArray<SkColor> colors;
         RefBox<SkXfermode> xmode;
         PODArray<uint16_t> indices;
         int indexCount);
 
 #undef RECORD
 
 }  // namespace SkRecords
 
 #endif//SkRecords_DEFINED