SkTileGrid: store insertion order, return results sorted by that.

dm/DMCpuGMTask.cpp

Index: dm/DMCpuGMTask.cpp
diff --git a/dm/DMCpuGMTask.cpp b/dm/DMCpuGMTask.cpp
index ceadc2627a1e3737a45485b2558bbc542f51483d..d39252adf6651b4f792f1a8d558ec73d1bebc4a3 100644
--- a/dm/DMCpuGMTask.cpp
+++ b/dm/DMCpuGMTask.cpp
@@ -46,9 +46,7 @@ void CpuGMTask::draw() {
     SPAWN(QuiltTask, fGMFactory(NULL), bm, QuiltTask::kNone_BBH,     QuiltTask::kSkRecord_Backend);
     SPAWN(QuiltTask, fGMFactory(NULL), bm, QuiltTask::kRTree_BBH,    QuiltTask::kSkRecord_Backend);
     SPAWN(QuiltTask, fGMFactory(NULL), bm, QuiltTask::kQuadTree_BBH, QuiltTask::kSkRecord_Backend);
-    /*  TODO: Failing, not sure why.  Enable these when passing.
     SPAWN(QuiltTask, fGMFactory(NULL), bm, QuiltTask::kTileGrid_BBH, QuiltTask::kSkRecord_Backend);
-    */
 
     SPAWN(SerializeTask, fGMFactory(NULL), bm, SerializeTask::kNormal_Mode);
     SPAWN(SerializeTask, fGMFactory(NULL), bm, SerializeTask::kSkRecord_Mode);