Add new experimental API to SkPicture to get "id" of current op

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 330 matching lines @@
 
     private:
         typedef SkNoncopyable INHERITED;
     };
 
     /** PRIVATE / EXPERIMENTAL -- do not call
         Return the operations required to render the content inside 'queryRect'.
     */
     const OperationList& EXPERIMENTAL_getActiveOps(const SkIRect& queryRect);
 
+    /** PRIVATE / EXPERIMENTAL -- do not call
+        Return the ID of the operation currently being executed when playing
+        back. 0 indicates no call is active.
+    */
+    size_t EXPERIMENTAL_curOpID() const;
+
     void createHeader(SkPictInfo* info) const;
     static bool IsValidPictInfo(const SkPictInfo& info);
 
     friend class SkFlatPicture;
     friend class SkPicturePlayback;
     friend class SkGpuDevice;
+    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.
  *
  *  The resulting drawing is undefined, as there is no guarantee how often the
  *  callback will be invoked. If the abort happens inside some level of nested
  *  calls to save(), restore will automatically be called to return the state
  *  to the same level it was before the drawPicture call was made.
  */
 class SK_API SkDrawPictureCallback {
 public:
     SkDrawPictureCallback() {}
     virtual ~SkDrawPictureCallback() {}
 
     virtual bool abortDrawing() = 0;
 };
 
 #endif