change drawPicture in SkRecord to just ref the picture

src/core/SkRecorder.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 SkRecorder_DEFINED
 #define SkRecorder_DEFINED
 
@@ skipping 87 matching lines @@
     void onDrawPicture(const SkPicture* picture) SK_OVERRIDE;
 
     void onPushCull(const SkRect& cullRect) SK_OVERRIDE;
     void onPopCull() SK_OVERRIDE;
 
 private:
     template <typename T>
     T* copy(const T*);
 
     template <typename T>
-    T* copy(const T[], unsigned count);
+    T* copy(const T[], size_t count);
 
     SkRecord* fRecord;
 };
 
 #endif//SkRecorder_DEFINED