Add return value on GrRecordReplaceDraw

src/gpu/GrRecordReplaceDraw.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 GrRecordReplaceDraw_DEFINED
 #define GrRecordReplaceDraw_DEFINED
 
@@ skipping 83 matching lines @@
                                          const SkMatrix& ctm) const;
 
 private:
     SkTDynamicHash<ReplacementInfo, ReplacementInfo::Key> fReplacementHash;
 
     void freeAll();
 };
 
 // Draw an SkPicture into an SkCanvas replacing saveLayer/restore blocks with
 // drawBitmap calls.  A convenience wrapper around SkRecords::Draw.
-void GrRecordReplaceDraw(const SkPicture*,
-                         SkCanvas*,
-                         const GrReplacements*,
-                         const SkMatrix& initialMatrix,
-                         SkDrawPictureCallback*);
+// It returns the number of saveLayer/restore blocks replaced with drawBitmap calls.
+int GrRecordReplaceDraw(const SkPicture*,
+                        SkCanvas*,
+                        const GrReplacements*,
+                        const SkMatrix& initialMatrix,
+                        SkDrawPictureCallback*);
 
 #endif // GrRecordReplaceDraw_DEFINED