Update DM JSON format.

dm/DMQuiltTask.cpp

 #include "DMQuiltTask.h"
 #include "DMUtil.h"
 #include "DMWriteTask.h"
 
 #include "SkBBHFactory.h"
 #include "SkCommandLineFlags.h"
 #include "SkPicture.h"
 #include "SkTaskGroup.h"
 
 DEFINE_bool(quilt, true, "If true, draw GM via a picture into a quilt of small tiles and compare.");
@@ skipping 89 matching lines @@
         for (int y = 0; y < tiles_needed(full.height(), FLAGS_quiltTile); y++) {
             for (int x = 0; x < tiles_needed(full.width(), FLAGS_quiltTile); x++) {
                 // Deletes itself when done.
                 tg.add(new Tile(x, y, *recorded, &full));
             }
         }
     }
 
     if (!BitmapsEqual(full, fReference)) {
         this->fail();
-        this->spawnChild(SkNEW_ARGS(WriteTask, (*this, full)));
+        this->spawnChild(SkNEW_ARGS(WriteTask, (*this, "GM", full)));
     }
 }
 
 bool QuiltTask::shouldSkip() const {
     if (fGM->getFlags() & skiagm::GM::kSkipPicture_Flag) {
         return true;
     }
     return !FLAGS_quilt;
 }
 
 }  // namespace DM