cc: Implement tiling iterator based on pyramid sequence.

cc/base/tiling_data.h

Index: cc/base/tiling_data.h
diff --git a/cc/base/tiling_data.h b/cc/base/tiling_data.h
index 06eb2520a3b4b1c2e0f3df5cf227d7a43812d542..c98d7b3f66d04af002b500d867e86eb66c9065f4 100644
--- a/cc/base/tiling_data.h
+++ b/cc/base/tiling_data.h
@@ -10,6 +10,7 @@
 #include "base/logging.h"
 #include "cc/base/cc_export.h"
 #include "cc/base/index_rect.h"
+#include "cc/base/pyramid_sequence.h"
 #include "cc/base/reverse_spiral_iterator.h"
 #include "cc/base/spiral_iterator.h"
 #include "ui/gfx/geometry/rect.h"
@@ -60,6 +61,8 @@ class CC_EXPORT TilingData {
   int LastBorderTileYIndexFromSrcCoord(int src_position) const;
   // Return the tile indices around the given rect.
   IndexRect TileAroundIndexRect(const gfx::Rect& center_rect) const;
+  // Return the absolute tile indices around the given rect.
+  IndexRect TileAroundAbsoluteIndexRect(const gfx::Rect& center_rect) const;
 
   gfx::Rect ExpandRectIgnoringBordersToTileBounds(const gfx::Rect& rect) const;
   gfx::Rect ExpandRectToTileBounds(const gfx::Rect& rect) const;
@@ -76,6 +79,9 @@ class CC_EXPORT TilingData {
   // Difference between TileBound's and TileBoundWithBorder's origin().
   gfx::Vector2d TextureOffset(int x_index, int y_index) const;
 
+  // Returns true if tiling-iterator is specified as pyramid-sequence.
+  static bool IsPyramidSequenceEnabled();
+
   class CC_EXPORT BaseIterator {
    public:
     operator bool() const { return index_x_ != -1 && index_y_ != -1; }
@@ -143,11 +149,22 @@ class CC_EXPORT TilingData {
     SpiralDifferenceIterator(const TilingData* tiling_data,
                              const gfx::Rect& consider_rect,
                              const gfx::Rect& ignore_rect,
-                             const gfx::Rect& center_rect);
+                             const gfx::Rect& center_rect,
+                             const bool use_pyramid_sequence);
+    SpiralDifferenceIterator(const SpiralDifferenceIterator& other);
+    SpiralDifferenceIterator(SpiralDifferenceIterator&& other);
+    ~SpiralDifferenceIterator();
+
+    SpiralDifferenceIterator& operator=(const SpiralDifferenceIterator& other);
+    SpiralDifferenceIterator& operator=(SpiralDifferenceIterator&& other);
+
     SpiralDifferenceIterator& operator++();
 
    private:
     SpiralIterator spiral_iterator_;
+    bool use_pyramid_sequence_;
+    PyramidSequence pyramid_sequence_;
+    PyramidSequence::Iterator iterator_;
   };
 
   class CC_EXPORT ReverseSpiralDifferenceIterator
@@ -157,11 +174,25 @@ class CC_EXPORT TilingData {
     ReverseSpiralDifferenceIterator(const TilingData* tiling_data,
                                     const gfx::Rect& consider_rect,
                                     const gfx::Rect& ignore_rect,
-                                    const gfx::Rect& center_rect);
+                                    const gfx::Rect& center_rect,
+                                    const bool use_pyramid_sequence);
+    ReverseSpiralDifferenceIterator(
+        const ReverseSpiralDifferenceIterator& other);
+    ReverseSpiralDifferenceIterator(ReverseSpiralDifferenceIterator&& other);
+    ~ReverseSpiralDifferenceIterator();
+
+    ReverseSpiralDifferenceIterator& operator=(
+        const ReverseSpiralDifferenceIterator& other);
+    ReverseSpiralDifferenceIterator& operator=(
+        ReverseSpiralDifferenceIterator&& other);
+
     ReverseSpiralDifferenceIterator& operator++();
 
    private:
     ReverseSpiralIterator reverse_spiral_iterator_;
+    bool use_pyramid_sequence_;
+    PyramidSequence pyramid_sequence_;
+    PyramidSequence::ReverseIterator reverse_iterator_;
   };
 
  private: