Begin atlasing

src/core/SkPicturePlayback.h

Index: src/core/SkPicturePlayback.h
diff --git a/src/core/SkPicturePlayback.h b/src/core/SkPicturePlayback.h
index b929a735b4dcd74475b233f59f581623eae8d249..f5260f8d0f1fb4b9695e2f1039f53f20e923fd0d 100644
--- a/src/core/SkPicturePlayback.h
+++ b/src/core/SkPicturePlayback.h
@@ -353,6 +353,8 @@ private:
             SkIPoint        fPos;
             SkBitmap*       fBM;     // fBM is allocated so ReplacementInfo can remain POD
             const SkPaint*  fPaint;  // Note: this object doesn't own the paint
+
+            SkIRect         fSrcRect;
         };
 
         ~PlaybackReplacements() { this->freeAll(); }