cc: Implement tiling iterator based on pyramid sequence.

cc/tiles/tiling_set_eviction_queue.h

Index: cc/tiles/tiling_set_eviction_queue.h
diff --git a/cc/tiles/tiling_set_eviction_queue.h b/cc/tiles/tiling_set_eviction_queue.h
index 493d74a8c82c1f5cb577ff8981cacb92b273e1be..960dcef49b146628eddb5681789ef9038b14d83b 100644
--- a/cc/tiles/tiling_set_eviction_queue.h
+++ b/cc/tiles/tiling_set_eviction_queue.h
@@ -97,6 +97,12 @@ class CC_EXPORT TilingSetEvictionQueue {
         std::vector<PictureLayerTiling*>* tilings,
         WhichTree tree,
         PictureLayerTiling::PriorityRectType priority_rect_type);
+    EvictionRectIterator(const EvictionRectIterator& other) = default;
+    EvictionRectIterator(EvictionRectIterator&& other) = default;
+
+    EvictionRectIterator& operator=(const EvictionRectIterator& other) =
+        default;
+    EvictionRectIterator& operator=(EvictionRectIterator&& other) = default;
 
     bool done() const { return !prioritized_tile_.tile(); }
     const PrioritizedTile& operator*() const { return prioritized_tile_; }
@@ -122,6 +128,15 @@ class CC_EXPORT TilingSetEvictionQueue {
     PendingVisibleTilingIterator(std::vector<PictureLayerTiling*>* tilings,
                                  WhichTree tree,
                                  bool return_required_for_activation_tiles);
+    PendingVisibleTilingIterator(const PendingVisibleTilingIterator& other) =
+        default;
+    PendingVisibleTilingIterator(PendingVisibleTilingIterator&& other) =
+        default;
+
+    PendingVisibleTilingIterator& operator=(
+        const PendingVisibleTilingIterator& other) = default;
+    PendingVisibleTilingIterator& operator=(
+        PendingVisibleTilingIterator&& other) = default;
 
     PendingVisibleTilingIterator& operator++();
 
@@ -140,6 +155,13 @@ class CC_EXPORT TilingSetEvictionQueue {
                           bool return_occluded_tiles,
                           bool return_required_for_activation_tiles);
 
+    VisibleTilingIterator(const VisibleTilingIterator& other) = default;
+    VisibleTilingIterator(VisibleTilingIterator&& other) = default;
+
+    VisibleTilingIterator& operator=(const VisibleTilingIterator& other) =
+        default;
+    VisibleTilingIterator& operator=(VisibleTilingIterator&& other) = default;
+
     VisibleTilingIterator& operator++();
 
    private:
@@ -155,6 +177,12 @@ class CC_EXPORT TilingSetEvictionQueue {
     SkewportTilingIterator() = default;
     SkewportTilingIterator(std::vector<PictureLayerTiling*>* tilings,
                            WhichTree tree);
+    SkewportTilingIterator(const SkewportTilingIterator& other) = default;
+    SkewportTilingIterator(SkewportTilingIterator&& other) = default;
+
+    SkewportTilingIterator& operator=(const SkewportTilingIterator& other) =
+        default;
+    SkewportTilingIterator& operator=(SkewportTilingIterator&& other) = default;
 
     SkewportTilingIterator& operator++();
 
@@ -167,6 +195,13 @@ class CC_EXPORT TilingSetEvictionQueue {
     SoonBorderTilingIterator() = default;
     SoonBorderTilingIterator(std::vector<PictureLayerTiling*>* tilings,
                              WhichTree tree);
+    SoonBorderTilingIterator(const SoonBorderTilingIterator& other) = default;
+    SoonBorderTilingIterator(SoonBorderTilingIterator&& other) = default;
+
+    SoonBorderTilingIterator& operator=(const SoonBorderTilingIterator& other) =
+        default;
+    SoonBorderTilingIterator& operator=(SoonBorderTilingIterator&& other) =
+        default;
 
     SoonBorderTilingIterator& operator++();
 
@@ -179,6 +214,13 @@ class CC_EXPORT TilingSetEvictionQueue {
     EventuallyTilingIterator() = default;
     EventuallyTilingIterator(std::vector<PictureLayerTiling*>* tilings,
                              WhichTree tree);
+    EventuallyTilingIterator(const EventuallyTilingIterator& other) = default;
+    EventuallyTilingIterator(EventuallyTilingIterator&& other) = default;
+
+    EventuallyTilingIterator& operator=(const EventuallyTilingIterator& other) =
+        default;
+    EventuallyTilingIterator& operator=(EventuallyTilingIterator&& other) =
+        default;
 
     EventuallyTilingIterator& operator++();