cc: Fix tiling raster iterator to process all tiles correctly.

cc/resources/picture_layer_tiling.h

 // Copyright 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CC_RESOURCES_PICTURE_LAYER_TILING_H_
 #define CC_RESOURCES_PICTURE_LAYER_TILING_H_
 
 #include <utility>
 #include <vector>
 
@@ skipping 39 matching lines @@
  public:
   class CC_EXPORT TilingRasterTileIterator {
    public:
     TilingRasterTileIterator();
     TilingRasterTileIterator(PictureLayerTiling* tiling, WhichTree tree);
     ~TilingRasterTileIterator();
 
     operator bool() const { return !!current_tile_; }
     const Tile* operator*() const { return current_tile_; }
     Tile* operator*() { return current_tile_; }
-    TilePriority::PriorityBin get_type() const { return type_; }
+    TilePriority::PriorityBin get_type() const {
+      switch (phase_) {
+        case VISIBLE_RECT:
+          return TilePriority::NOW;
+        case SKEWPORT_RECT:
+        case SOON_BORDER_RECT:
+          return TilePriority::SOON;
+        case EVENTUALLY_RECT:
+          return TilePriority::EVENTUALLY;
+      }
+      NOTREACHED();
+      return TilePriority::EVENTUALLY;
+    }
 
     TilingRasterTileIterator& operator++();
 
     gfx::Rect TileBounds() const {
       DCHECK(*this);
-      if (type_ == TilePriority::NOW) {
+      if (phase_ == VISIBLE_RECT) {
         return tiling_->tiling_data_.TileBounds(visible_iterator_.index_x(),
                                                 visible_iterator_.index_y());
       }
       return tiling_->tiling_data_.TileBounds(spiral_iterator_.index_x(),
                                               spiral_iterator_.index_y());
     }
 
    private:
+    enum Phase {
+      VISIBLE_RECT,
+      SKEWPORT_RECT,
+      SOON_BORDER_RECT,
+      EVENTUALLY_RECT
+    };
+
     void AdvancePhase();
     bool TileNeedsRaster(Tile* tile) const {
       RasterMode mode = tile->DetermineRasterModeForTree(tree_);
       return tile->NeedsRasterForMode(mode);
     }
 
     PictureLayerTiling* tiling_;
 
-    TilePriority::PriorityBin type_;
+    Phase phase_;
     gfx::Rect visible_rect_in_content_space_;
     gfx::Rect skewport_in_content_space_;
     gfx::Rect eventually_rect_in_content_space_;
     gfx::Rect soon_border_rect_in_content_space_;
     WhichTree tree_;
 
     Tile* current_tile_;
     TilingData::Iterator visible_iterator_;
     TilingData::SpiralDifferenceIterator spiral_iterator_;
-    bool skewport_processed_;
   };
 
   class CC_EXPORT TilingEvictionTileIterator {
    public:
     TilingEvictionTileIterator();
     TilingEvictionTileIterator(PictureLayerTiling* tiling,
                                TreePriority tree_priority);
     ~TilingEvictionTileIterator();
 
     operator bool() const;
@@ skipping 208 matching lines @@
 
  private:
   DISALLOW_ASSIGN(PictureLayerTiling);
 
   RectExpansionCache expansion_cache_;
 };
 
 }  // namespace cc
 
 #endif  // CC_RESOURCES_PICTURE_LAYER_TILING_H_