Retract SkPicture::kOptimizeForClippedPlayback_RecordingFlag from public API

src/core/SkQuadTreePicture.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 SkQuadTreePicture_DEFINED
 #define SkQuadTreePicture_DEFINED
 
 #include "SkPicture.h"
 #include "SkRect.h"
 
 /**
- * Subclass of SkPicture that override the behavior of the
- * kOptimizeForClippedPlayback_RecordingFlag by creating an SkQuadGrid
- * structure rather than an R-Tree. The quad tree has generally faster
+ * Subclass of SkPicture that creates an SkQuadGrid
+ * structure. The quad tree has generally faster
  * tree creation time, but slightly slower query times, as compared to
  * R-Tree, so some cases may be faster and some cases slower.
  */
 class SK_API SkQuadTreePicture : public SkPicture {
 public:
     SkQuadTreePicture(const SkIRect& bounds) : fBounds(bounds) {}
     virtual SkBBoxHierarchy* createBBoxHierarchy() const SK_OVERRIDE;
 private:
     SkIRect fBounds;
 
     typedef SkPicture INHERITED;
 };
 
 class SkQuadTreePictureFactory : public SkPictureFactory {
-private:
+public:
+    SkQuadTreePictureFactory() {}
+
     virtual SkPicture* create(int width, int height) SK_OVERRIDE {
         return SkNEW_ARGS(SkQuadTreePicture, (SkIRect::MakeWH(width, height)));
     }
 
 private:
     typedef SkPictureFactory INHERITED;
 };
 
 #endif