Rename SkDrawPictureCallback to SkPicture::AbortCallback

include/core/SkDrawPictureCallback.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 SkDrawPictureCallback_DEFINED
 #define SkDrawPictureCallback_DEFINED
 
 #include "SkTypes.h"
 
+#ifdef SK_LEGACY_DRAWPICTURECALLBACK
+#include "SkPicture.h"
+
 /**
  *  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 {
+class SK_API SkDrawPictureCallback : public SkPicture::AbortCallback {
 public:
-    SkDrawPictureCallback() {}
-    virtual ~SkDrawPictureCallback() {}
+    virtual bool abortDrawing() = 0;
 
-    virtual bool abortDrawing() = 0;
+    bool abort() SK_OVERRIDE { return this->abortDrawing(); }
 };
+#endif
 
-#endif//SkDrawPictureCallback_DEFINED
+#endif // SkDrawPictureCallback_DEFINED