cc: Implement tile iteration order based on pyramid sequence. [old]

cc/tiles/tiling_set_raster_queue_required.cc

Index: cc/tiles/tiling_set_raster_queue_required.cc
diff --git a/cc/tiles/tiling_set_raster_queue_required.cc b/cc/tiles/tiling_set_raster_queue_required.cc
index 412942c96403149f782ff7fcff61394f3aa628e0..dc70ede26a36dbd2116aa27618efbfe7a112116c 100644
--- a/cc/tiles/tiling_set_raster_queue_required.cc
+++ b/cc/tiles/tiling_set_raster_queue_required.cc
@@ -112,12 +112,25 @@ TilingSetRasterQueueRequired::TilingIterator::TilingIterator(
   ++(*this);
 }
 
+TilingSetRasterQueueRequired::TilingIterator::TilingIterator(
+    const TilingSetRasterQueueRequired::TilingIterator& other) = default;
+
+TilingSetRasterQueueRequired::TilingIterator::TilingIterator(
+    TilingSetRasterQueueRequired::TilingIterator&& other) = default;
+
 TilingSetRasterQueueRequired::TilingIterator::~TilingIterator() {
 }
 
 TilingSetRasterQueueRequired::TilingIterator&
-    TilingSetRasterQueueRequired::TilingIterator::
-    operator++() {
+TilingSetRasterQueueRequired::TilingIterator::operator=(
+    const TilingSetRasterQueueRequired::TilingIterator& other) = default;
+
+TilingSetRasterQueueRequired::TilingIterator&
+TilingSetRasterQueueRequired::TilingIterator::operator=(
+    TilingSetRasterQueueRequired::TilingIterator&& other) = default;
+
+TilingSetRasterQueueRequired::TilingIterator&
+    TilingSetRasterQueueRequired::TilingIterator::operator++() {
   Tile* tile = nullptr;
   while (true) {
     ++visible_iterator_;