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..d91c3859340e7fb27420a4922c7892c1b0dbae5c 100644
--- a/cc/layers/picture_layer_impl.h
+++ b/cc/layers/picture_layer_impl.h
@@ -77,15 +77,44 @@ class CC_EXPORT PictureLayerImpl
     operator bool() const;
 
    private:
+    enum RangeType {
+      HIGHER_THAN_HIGH_RES,
+      LOWER_THAN_LOW_RES,
+      BETWEEN_HIGH_AND_LOW_RES,
+      LOW_RES,
+      HIGH_RES,
+      NUM_RANGE_TYPES
+    };
+    struct TilingIterationRange {
+      int tiling_offset;
+      int count;
+    };
+    struct IterationStage {
+      IterationStage(TilePriority::PriorityBin type, bool is_required)

[reveman, 2014/07/31 15:32:48]

style nit: use the same name for ctor arguments and members

[vmpstr, 2014/08/01 06:04:48]

This is gone now.

+          : tile_type(type), required_for_activation(is_required) {}
+
+      TilePriority::PriorityBin tile_type;
+      bool required_for_activation;
+    };
+
+    void SetEmptyRange(RangeType type);
+    void SetRange(RangeType type, int start_index, int end_index);
+
+    int GetCurrentTilingIndex();
+    void ConstructRanges();
+    bool CurrentTilingIndexInRange();
     void AdvanceToNextIterator();
-    bool IsCorrectType(
-        PictureLayerTiling::TilingEvictionTileIterator* it) const;
+    bool AdvanceTiling();
+    bool AdvanceRange();
+    bool AdvanceStage();
 
-    std::vector<PictureLayerTiling::TilingEvictionTileIterator> iterators_;
-    size_t iterator_index_;
-    TilePriority::PriorityBin iteration_stage_;
-    bool required_for_activation_;
+    PictureLayerTiling::TilingEvictionTileIterator iterator_;
+    int current_range_offset_;
+    RangeType current_range_type_;
+    IterationStage current_stage_;
 
+    TilingIterationRange ranges_[NUM_RANGE_TYPES];
+    TreePriority tree_priority_;
     PictureLayerImpl* layer_;
   };