Rename SkDrawPictureCallback to SkAbortCallback

src/core/SkPicturePlayback.h

Index: src/core/SkPicturePlayback.h
diff --git a/src/core/SkPicturePlayback.h b/src/core/SkPicturePlayback.h
index 32d8c162a7d7d7157cda3d505634947b653cdba2..85db7f9e5c921a1bd3a4911cd6951620cdabfb5d 100644
--- a/src/core/SkPicturePlayback.h
+++ b/src/core/SkPicturePlayback.h
@@ -12,7 +12,7 @@
 
 class SkBitmap;
 class SkCanvas;
-class SkDrawPictureCallback;
+class SkAbortCallback;
 class SkPaint;
 class SkPictureData;
 
@@ -25,7 +25,7 @@ public:
     }
     virtual ~SkPicturePlayback() { }
 
-    virtual void draw(SkCanvas* canvas, SkDrawPictureCallback*);
+    virtual void draw(SkCanvas* canvas, SkAbortCallback*);
 
     // TODO: remove the curOp calls after cleaning up GrGatherDevice
     // Return the ID of the operation currently being executed when playing