Reduce ref counting in SkPictureRecorder.

include/core/SkPicture.h

 /*
  * Copyright 2007 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 
 #ifndef SkPicture_DEFINED
 #define SkPicture_DEFINED
@@ skipping 241 matching lines @@
     // Only SKPs within the min/current picture version range (inclusive) can be read.
     static const uint32_t MIN_PICTURE_VERSION = 35;     // Produced by Chrome M39.
     static const uint32_t CURRENT_PICTURE_VERSION = 41;
 
     static_assert(MIN_PICTURE_VERSION <= 41,
                   "Remove kFontFileName and related code from SkFontDescriptor.cpp.");
 
     void createHeader(SkPictInfo* info) const;
     static bool IsValidPictInfo(const SkPictInfo& info);
 
-    // Takes ownership of the SkRecord and (optional) SnapshotArray, refs the (optional) BBH.
+    // Takes ownership of the (optional) SnapshotArray.
+    // For performance, we take ownership of the caller's refs on the SkRecord and BBH.
     SkPicture(const SkRect& cullRect,
               SkRecord*,
               SnapshotArray*,
               SkBBoxHierarchy*,
               size_t approxBytesUsedBySubPictures);
 
     static SkPicture* Forwardport(const SkPictInfo&, const SkPictureData*);
     static SkPictureData* Backport(const SkRecord&, const SkPictInfo&,
                                    SkPicture const* const drawablePics[], int drawableCount);
 
@@ skipping 26 matching lines @@
 
     friend class SkPictureRecorder;            // SkRecord-based constructor.
     friend class GrLayerHoister;               // access to fRecord
     friend class ReplaceDraw;
     friend class SkPictureUtils;
     friend class SkRecordedDrawable;
 };
 SK_COMPILE_ASSERT(sizeof(SkPicture) <= 88, SkPictureSize);
 
 #endif