Rename SkDrawPictureCallback to SkAbortCallback

include/core/SkDrawPictureCallback.h

Index: include/core/SkDrawPictureCallback.h
diff --git a/include/core/SkDrawPictureCallback.h b/include/core/SkDrawPictureCallback.h
index d5a360ee8ee08029d44705912051b3906240be64..206fdae08f8a6d0d0610f27eb70fd9507a3e1a78 100644
--- a/include/core/SkDrawPictureCallback.h
+++ b/include/core/SkDrawPictureCallback.h
@@ -10,6 +10,9 @@
 
 #include "SkTypes.h"
 
+#ifdef SK_LEGACY_DRAWPICTURECALLBACK
+#include "SkAbortCallback.h"
+
 /**
  *  Subclasses of this can be passed to canvas.drawPicture(). During the drawing
  *  of the picture, this callback will periodically be invoked. If its
@@ -20,12 +23,12 @@
  *  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 SkAbortCallback {
 public:
-    SkDrawPictureCallback() {}
-    virtual ~SkDrawPictureCallback() {}
-
     virtual bool abortDrawing() = 0;
+
+    bool abort() SK_OVERRIDE { return this->abortDrawing(); }
 };
+#endif
 
-#endif//SkDrawPictureCallback_DEFINED
+#endif // SkDrawPictureCallback_DEFINED