cc: Remove vectors from tiling eviction tile iterator.

cc/layers/picture_layer_impl.h

Index: cc/layers/picture_layer_impl.h
diff --git a/cc/layers/picture_layer_impl.h b/cc/layers/picture_layer_impl.h
index d49205137510bd9d5f3bc57e89a785d42de65616..fdde7d2c664b9b9de9e291ea79b9f5c4ec30fe74 100644
--- a/cc/layers/picture_layer_impl.h
+++ b/cc/layers/picture_layer_impl.h
@@ -77,14 +77,26 @@ class CC_EXPORT PictureLayerImpl
     operator bool() const;
 
    private:
+    // The order of this enum determines the order of tiling iteration.
+    enum TilingIterationDirection {
+      HIGHER_THAN_HIGH_RES,
+      LOWER_THAN_HIGH_RES,
+      LOW_RES,
+      HIGH_RES,
+      NUM_ITERATION_DIRECTIONS
+    };

[reveman, 2014/07/29 01:24:25]

Can you describe all the phases that this iterator goes through. Is it each one
of these directions for each iteration stage? Btw, why is it called a direction?
rather then say a phase, or stage?

+
     void AdvanceToNextIterator();
-    bool IsCorrectType(
-        PictureLayerTiling::TilingEvictionTileIterator* it) const;
+    bool AdvanceNextTilingIndex();
 
-    std::vector<PictureLayerTiling::TilingEvictionTileIterator> iterators_;
-    size_t iterator_index_;
+    PictureLayerTiling::TilingEvictionTileIterator iterator_;
+    size_t tiling_index_;
+    TilingIterationDirection tiling_direction_;
     TilePriority::PriorityBin iteration_stage_;
     bool required_for_activation_;
+    size_t high_res_tiling_index_;
+    size_t low_res_tiling_index_;
+    TreePriority tree_priority_;
 
     PictureLayerImpl* layer_;
   };