First pass at pre-rendering saveLayers for GPU

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
@@ skipping 459 matching lines @@
     */
     size_t EXPERIMENTAL_curOpID() const;
 
     void createHeader(SkPictInfo* info) const;
     static bool IsValidPictInfo(const SkPictInfo& info);
 
     friend class SkFlatPicture;
     friend class SkPicturePlayback;
     friend class SkPictureRecorder;
     friend class SkGpuDevice;
+    friend class GrGatherCanvas;
     friend class GrGatherDevice;
     friend class SkDebugCanvas;
 
     typedef SkRefCnt INHERITED;
 };
 
 /**
  *  Subclasses of this can be passed to canvas.drawPicture. During the drawing
  *  of the picture, this callback will periodically be invoked. If its
  *  abortDrawing() returns true, then picture playback will be interrupted.
@@ skipping 24 matching lines @@
     typedef SkRefCnt INHERITED;
 };
 
 #endif
 
 #ifdef SK_SUPPORT_LEGACY_PICTURE_HEADERS
 #include "SkPictureRecorder.h"
 #endif
 
 #endif